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1  Bitcoin / Hardware / [Review] Spondoolies SP20E Jackson review by 2GOOD on: December 23, 2014, 02:01:39 PM
I got my SP20 a little later after some problems with the Customs, not believing that I can get something for free. Anyway that's not the story of this post, here is it the nice and shiny SP20 JACKSON well packed in a sturdy eco-friendly box.



What you see is what you get - the device and that's all. I'm OK with that Smiley

Before I start this little beast I was worried about power delivery, it has only 4 PCIe 6-pin power connectors, this with combination of 1200W at wall consumption gets me a little bit worried.
1200W @ Wall => ~1080 W @ 12V divided by 4 connectors and you get 270W per PCIe or 7.5 Amps per cable or even more during the test period for this review.



As a home miner sometimes I have to leave the "farm" unattended and melting cables is something I don't wanna see so I've decided to made some new 1.5 mm² high quality copper cables for my DPS 2000BB PSU, at a later point it gets clear that you can limit the power per connection from the software which is great especially with mixed power supplies.



The size of SP20 is close to Bitmain's Ants, maybe slightly longer:
D 380mm; W 110mm; H 140mm

Firs Impressions: very good build quality, well manufactured and pretty damn good looking for a bitcoin miner, not something that we actually need but it's welcomed



On the front of the device are all connections and air intake, at the back we have the exhaust FAN



Yes kitty this is the one that bothers you so much, but we'll get to that later.

Setup:
So you have to prepare one big 1200W power supply or two 600-750W, yes the device can run with two PSU. Network connectivity is via a standard Ethernet cable, just connect it to your home router (you need to have DHCP server ON) wait for the device to boot and point your browser to: http://myminer.io



User friendly way to determine the IP address of your device, now just click on Go to miner link and enter the default user/pass: admin/admin
The setup is easy, just enter your preferred pools, you can drag to reorder them. You are now mining Smiley



Specification and Performance:

As mentioned above I power my SP20 with Delta DPS 2000BB PSU 90-92% eff.



The miner has two boards  each with 4 Rockerbox 28nm ASICs
Rated hash rate: 200 GH/s per chip
Rated Voltage: 0.7 V, voltage range is 0.63 V - 0.8 V

Spondoolies sell the device as 1700GH, I didn't pushed it so high - here are some results:



On the settings page of the miner you have two options Basic and Advanced voltage setting, test 1 to 7 are on advanced settings, while the last 3 represents the user friendly setups:
SF, MR - slow fans, medium rate
MF, HR - medium fans, high rate
TF, HeR - turbo fans, highest rate

The results are astonishing, especially the efficiency in the first test 0.5W per GH @ wall is by me a great achievement, I'll probably switch to test 1 to 3 in the spring or early summer depending on bitcoin difficulty and prices. It's great to have this flexibility which extends the life of the miner. For now I'm using the miner with test 5 setup - a great balance efficiency/hashrate/loudness.

At the Asic stats tab you have advanced statistic of the current state of the device, this includes power consumption per LOOP (2 chips), DC2DC voltage and temperature, ASIC temps and so on. I'm very happy with this screen it gives me the whole information that I need to precisely tweak my unit.



The back chips are getting hotter air that's why their temp is higher, to keep them cool you can set lower start voltage for them, and limit the power for unit 2 and 4. By doing so the software will try to keep them at the maximum power defined while bellow 125C and you can go low enogh to undervolt. Basically you can maxout the front chips and undervolt the back - this is so far the first bitcoin asic miner I test that supports this kind of tweaking - amazing.



When you apply new settings the miner's chips are powered with start volts and the fw slowly increases the voltage to the higher setting, if the temp for a specific chip reaches 125C the chip resets and it's voltage is dropped slightly until max point for this specific ASIC is found. This point depends on the environment temperature, fan speed, specific chip characteristics etc.

Cooling:





One very powerful 120mm Y.S.TECH fan is used in the negative pressure tunnel. A lot of pages in this forum about how load in reality is this miner... what to say It is LOUD, but not that scary as some describe it only the cat doesn't like it much, but she is scared from the vacuum cleaner so no big surprise if you know what i mean Wink Maybe I'm used to Technobit's loud miners and can't be surprised that easily anymore, but in anyway this device is not suitable for home environment as Spondoolies presented it: "HOME MINING IS BACK"



The two boards are vertical, while chips are aligned in a chessboard pattern, but still the back chips get a lot hotter air. If the miner wasn't designed in "carrier grade/data center" in mind but more home oriented they could of put the boards horizontally and use two 120mm fans, that way each chip gets cool air, yes the upper board will be slightly hotter but they can even seperate the boards with metal, it's all a point of engineering and solutions can be found. Don't get me wrong this is so far the best miner I had, but that's just human nature - we always want more and better - this is how progress is driven Wink



IMO the problem with cooling is not the fan, but the asic's heatsinks, some users on the forum managed to "unglue" them and it turns out that the copper shim is not bolted or something but just sitting there between the chip and the heatsink, so you have two heat transfers via thermal compound once from the chip to copper and another to the heatsink itself. Personally I'm not planing to mod this for now, maybe when the winter is over.



I'm a big fan of fully automated autonomous devices, ones that you can set and forget. This miner is close to that goal, maybe Spoondolies will automate the fan in future fw update. I would like to see min and max fan settings, and maybe target output temp (top) setting with these inputs a script can regulate the fan within the defined range while keeping the device cool and at maximum performance. In the end they advertise SP20 as a "home miner", and a typical resident have to leave the miners unattended once and a while not to worry about the weather or neighbors calling 911 to rescue that "wild cat" trapped in the garage for days Smiley

Pricing:
There is not much to say here. ATM You can choose from:
Technobit HEX4R - 850GH - 365$ (0.43$/GH)
Spondoolies SP20 - 1700GH - 659$ (0.38$/GH)
Bitmain Antminer S5 - 1155GH/s - 418$ (0.36$/GH) (just released)



Pros:
  • Reasonably priced
  • Full Software control
  • Great overclock/undervolt capabilities
  • Amazing efficiency at lower speeds
  • Easy to use, responsive and good looking interface

Cons:
  • Hard to reach advertised speeds
  • Auto fan feature will be nice
  • LOUD

Conclusion:
The Spondoolies SP20E Jackson is a very high quality bitcoin miner with great capabilities for custom performance optimization in terms of speed or efficiency. It's very easy to set up and runs flawlessly without an issue. The efficiency of the unit at lower speeds is amazing and implies longer life while keeping your bills low.

Full gallery can be found here: http://imgbox.com/g/f9dpu4eptX

best
2GOOD

2  Bitcoin / Hardware / [Review] Technobit HEX4R - 850GH RockerBox based miner on: December 23, 2014, 01:58:26 PM
The last miner from Technobit that I reviewed was HEX4M, a good board that later was transformed to an enclosed miner with two of these boards and custom cooling - 2HEX4M. Now I'm going to present you the next enclosed solution from Technobit - HEX4RBox based on the latest 28nm RockerBox ASIC chip from Spondoolies Tech.



The device looks identical with Antminer's S3, maybe slightly longer, to be precise: D 410mm; W 150mm; H 130mm

Specification and Performance:



The board is equipped with 4 Rockerbox ASICs and according to the specification each chip is rated at 200GH with a wide range of overclock/downclock options. On the other side Technobit  advertise the miner as 850GH, and here is my best result from these 4



More than 880GH is a very impressive result and as you can see the chips are at 800mV - the upper limit in the Spondoolies Specs. Now lets make some more tests and see what is the efficiency of the board:



The power supply used for the tests is Delta DPS 2000BB with 90-92% eff. In my previous reviews I used to calculate boards efficiency but since all major manufactures publish at WALL efficiency I made the switch and that's what the eff column represents. Keep in mind that your results may vary depending on your power supply.
As you can see from the chart above at maximum hashrate the efficiency is terrible by today's standards, but with lower settings things are looking better. You can play around with the settings, if some of the chips is getting low on power you will see increase in HW errors, a good indicator for your max freq. My personal best setting atm is 1040/760mV, I was trying to go lower than 690mV but apparently the fw doesn't support it and the miner just wont's start, at this voltage the performance is good and I believe that with some boards you can achieve better freq/hashrate.

Cooling:



The enclosed miner is cooled by two big SUNON fans in a push/pull configuration

PMD1212PMB1-A
Size / Dimension: 120mm L x 120mm H x 38mm W
Air Flow: 190.0 CFM (5.38m³/min)
Speed: 4200 RPM
Power: 19.2W
Noise: 54 dB(A)

Let me get this straight this is LOUD, no really it is and in any way it is not suitable for home usage at least not by my understandings. Luckily there is a realativly easy way to fix this, with a simple mod. You can just connect the two fans in series, that way the voltage is divided and they run at nearly half speed, by doing so you also have to keep the settings lower or do some more optimizations (keep reading).



Heat is dissipated from the chips by a huge heatsink on the top and thinner one on the bottom of the board helping also to cool down volt regulators. As you can see from the photos there is a lot of space and the fans are blowing out cold air that just passes by. Here are some tweaks, I changed the thermal compound with Arctic Cooling MX-4, but you can use your favorite, also very important step is to narrow the airflow by blocking empty space on top and side near the usb port. I did that with plastic cable tray holding in place by 3M double sided tape. You can also tape the 3 cable holes or use rubber grommet plugs that have pie slice cut flaps in them allow you to route the cables. With these mods and fans at half speed I can run the board at any speed without an issue. Things that can be improved by technobit in future projects, at least the airflow can be better and they can put some rubber grommets in the holes.


 
Really the top heatsink is an overkill, with this massive copper plate bolted into the aluminum. Even that there are 4 chips cooled by a single plate I don't recommend using thermal pads.

Pricing:
There is not much to say here. ATM You can choose from:
Technobit HEX4R - 850GH - 365$ (0.43$/GH)
Spondoolies SP20 - 1700GH - 659$ (0.38$/GH)
Bitmain Antminer S5 - 1155GH/s - 418$ (0.36$/GH) (just released)

I assume that Technobit will update their price, corresponding to new offers from Spondo and Bitmain. In any way as a resident of the EU I prefer to buy within the union - cheaper shipping and no issues with Customs and taxes.

Host device and Software:
As all other products from Technobit this is no exception, you need a host device to control the board that can be:
1. Take one TP-Link TL-MR3020 Router and flash it with the firmware from Technobit's website. Here is a great tutorial by Zich. You can also order it directly from them at slightly higher price, but pre-flashed and ready to rock. If you plan to use the router you will also need USB hub.
2. Windows based PC with patched version of cgminer that supports the HEX boards, more info how to run it here: CGMINER Windows build for TECHNOBIT's Boards
3. On a Linux based PC it will best to just compile cgminer with the latest patch from Technobit or download my build for Ubuntu x64 (link by request)
4. You can also use Raspberry Pi as a host device

Here is how to apply patch 0.4.0 and compile cgminer on linux host:
Code:
git clone https://github.com/ckolivas/cgminer.git
cd cgminer
wget https://dl.dropboxusercontent.com/u/8082585/Technobit/rev_9afd0a216a0f95adb650e4818f24af1a61ad837d.patch
git checkout 9afd0a216a0f95adb650e4818f24af1a61ad837d
patch < rev_9afd0a216a0f95adb650e4818f24af1a61ad837d.patch
./autogen.sh --enable-hexminerr
make

cgminer.conf settings needed:
Code:
"hexminerr-asic-diff" : "5",
"hexminerr-pic-roll" : "120",
"hexminerr-chip-mask" : "255",
"hexminerr-voltage" : "760",
"hexminerr-options" : "4:1040",



Pros:
  • Reasonably priced
  • Software voltage control
  • Good overclock/undervolt capabilities

Cons:
  • No thermal sensor
  • Host controller is needed
  • LOUD

Conclusion:
The efficiency of the board is not so good compared to SP20, Guy from spondoolies said that later batches are with better eff so that maybe one of the reasons. Other factor to blame is probably low efficient DC2DC regulators, also keep in mind that with SP20 the software can set voltage and freq to each chip independently. In any way this device is a step in the right direction for Technobit and I can't wait to test their 1 chip version called DICE.

Full gallery can be found here: http://imgbox.com/g/8sLfvmvAqF

best
2GOOD
3  Bitcoin / Hardware / Technobit HEX4M - 400GH BlackArrow based miner reviewed on: July 23, 2014, 05:10:49 PM
We've seen a lot of boards from Technobit and they all look pretty much the same - 8/16 chips on small board with an industrial heatsink. Now it's time to present you something slighly diffrent in a disgin point of view - The new Technobit board with 4 chips Minion chips from BlackArrow - HEX4M



This miner is huge compared to older products, the board itself is 250x250mm and the aluminium heatsink on the bottom is slightly larger 250x300mm
It's great to see that Technobit decided to use standard CPU coolers for this device, but will get to that later.


As usual the product was well packed, but I highly recommend to order the CPU coolers from your local retailer. First you will get lower shipping fees and it's more secure for the board to travel without the heatsinks attached, despite it's well mounted on aluminium plate.

Specification and Performance:



As mentioned above the board is equipped with 4 x 28nm Minion ASIC chips, BlackArrow insist that it's speed is 120GH with efficiency of 0.75 watts per Ghash on the other side Technobit advertise the miner as 400GH/s i.e. 100GH per chip. lets see the real world results:



Indeed with a clock settings 1016 Mhz and voltage of 0.805V the board speed is 400GH, however I was unable to achieve the stated speeds from BlackArrow's specifications: 1200Mhz @ 0.82V - 120GH.
Here is the performance chart of the board at various configurations:



The power supply used for the test is FSP Aurum S 600W, it is rated GOLD which means 90% efficiency, that's what the second power column is representing Wall power consumption minus 10%, the efficiency of the board is calculated with these numbers. The board is power by 2 x PCIe power connector, there is a space for a third connector but apparently Technobit decided that it's not needed. IMO 210 watts per PCIe connector is a lot (70W per wire) and maybe later revisions the board will be shipped with 3 connectors. As seen form the chart the efficiency for the whole miner is around 1W/GH, if we take into account 10-15% loss in DC/DC conversion the eff of the chip itself is 0.85 W/Ghash/second. I recommend running the board at 1016/805 which may differ from the default settings from technobit. Undervolt tests here

Cooling:



The top of the ASICs are cooled by AC Freezer 7 PRO Rev.2, but you can use any Intel s1150 compatible, since the coolers are not included by default - you have to order them separately from Technobit or for example they are on sale at **newegg - 25$

The whole board is placed on a big aluminium heatsink which has two functions:
1. To cool down the bottom of the board - chips and regulators
2. To prevent the board from bending

There is an extra Sunon 120mm fan to cool the base.

Keep in mind that I have a pre-production unit, the final revision will have special holdings for the bottom fan and the 4 "legs" will be at the corners of the board with the option for stacking. Also the boards will be shipped with custom made (lower) stands to attach the CPU cooler.

I'm happy to say that this unit is relatively quiet and totally useful in home environments.

Pricing:
At the time of writing you can buy HEX4M from Technobit for 379,00€ without the top coolers. As always investment in bitcoin equipment is risky but let's see where this price sits in comparison with other products from Technobit and various bitcoin mining manufactures:



As you can see from the chart, HEX4M is reasonably priced but once again the BITMAIN offers better price per GH for its Antminers, especially if you live in a country where Customs are not a problem for the rest of us importing an Chinese miner can be a hassle. The other problem for Antminer S3 is that it's currently sold out. Other interesting product to compete with the HEX4M is the new board from Technobit based on AsciMiner BE200 chips, I hope to get mine soon and review it.

Host device and Software:
As all other products from Technobit this is no exception, you need a host device to control the board that can be:
1. Take one TP-Link TL-MR3020 Router and flash it with the firmware from Technobit's website. Here is a great tutorial by Zich. You can also order it directly from them at slightly higher price, but pre-flashed and ready to rock. If you plan to use the router you will also need USB hub.
2. Windows based PC with patched version of cgminer that supports the HEX boards, more info how to run it here: CGMINER Windows build for TECHNOBIT's Boards (coming  soon)
3. On a Linux based PC it will best to just compile cgminer with the latest patch from Technobit or download my build for Ubuntu x64 (coming  soon)
4. You can also use Raspberry Pi as a host device - but it's not recommended - more info

Here is how to apply patch 0.3.6 and compile cgminer on linux host:
Code:
git clone https://github.com/ckolivas/cgminer.git
cd cgminer
wget http://bitcoinbg.eu/tools/technobit/rev_45dbbb4cac091e41b0123fd211b6293436921681.patch
git checkout 45dbbb4cac091e41b0123fd211b6293436921681
patch < rev_45dbbb4cac091e41b0123fd211b6293436921681.patch
./autogen.sh --enable-hexminerm
make

Start cgminer with the following line:
Code:
sudo ./cgminer -c ./cgminer.conf --hexminerm-options 4:1016 --hexminerm-voltage 805 --hexminerm-chip-mask 15 --hexminerm-hw-err-res 10 --hexminerm-nonce-timeout-secs 3 --hexminerm-pic-roll 90
where cgminer.conf is in the same folder and with your regular settings.



Pros:
  • Reasonably priced
  • Good Efficiency
  • Availability
  • Software voltage control
  • Quiet

Cons:
  • No thermal sensor
  • ...

Conclusion:
The efficiency of the board is good, but I was wondering if 1W/GH is good or bad at today's standards. The miner is very stable and pleased with the final product. In the end the Bulgaria based company once again did a great job with this challenge and AFAIK Technobit is the only one to offer assembly service for Minion ASICs.

Full gallery can be found here: http://imgbox.com/g/3gEyEjC5Ck

best
2GOOD

P.S.
===
I personally expected more LEDs on this board Wink
4  Economy / Economics / Bulgarian banking system under attack on: June 27, 2014, 06:17:17 PM
The Bulgarian central bank warned the financial industry is under organized attack by anonymous e-mails, texts and rumors, threatening the Balkan nation’s security...



More info here:
http://www.bbc.com/news/business-28052535
http://www.bloomberg.com/news/2014-06-27/bulgarian-lenders-under-attack-central-bank-chief-warns.html
http://in.reuters.com/article/2014/06/27/bulgaria-banks-idINL6N0P81SG20140627
5  Bitcoin / Hardware / Technobit HEX16B2 60GH BitFury rev.2 based miner in hand on: April 17, 2014, 03:23:09 PM
The Bulgarian company Technobit is producing bitcoin miners for 8 months now and for that time they delivered a lot of products, IMO the best one of them till now was the BitFury Based HEX16B So I'm anxious to see if it's successor is as good as the first version, this mainly depends on the BitFury chip itself.



Here is it, the updated HEX16B miner from Technobit. The miner looks identical with the previous version, no surprise here.



Performance:
At the Technobit's site the board is listed by the name HEX16B, but I nicknamed this one as HEX16B2 since it's using the new BitFury rev.2 chips. Revision 1 chip has 756 cores, while rev.2 chip has 864 rolled hash cores and improved performance and lower power consumption. This means that we should expect around 14% higher hashrate for almost the same consumption.



The first version of the board is hashing with 44Gh here we get almost 62, so we have around 40% better results in terms of hashrate but this is with higher settings. If we throw the same 540/900 setting at the new version the hashrate is 53GH or 20% improvement - not bad at all, good job BitFury



Here is a chart with various settings tested, together with the power drawn by the board.



As seen form the chart the efficiency is very good for a 55nm chip, even slightly better than the HEX8A1 Coincraft boards. These results suggest a longer use of the unit with the continuous difficulty increase.

Cooling:
The fan is the same 3000rpm Sunon:
Sunon EE92251S1-0000-A99
Dimensions:    92x92x25 mm
Power: 2.0 W
Speed: 3000 rpm
Air Flow: 51.5 CFM
Noise: 34 dB

It is silent enough, but if you plan to change it the Arctic Cooling F9 I would recommend lower settings for example 550/920 - summer is coming Wink

Pricing:
As always investment in bitcoin equipment is risky. With the latest bad news in the Bitcoin world the BTC price is relatively low, which makes buying a new mining equipment even riskier. but let's see what can you order/buy from various mining manufactures. Techobit are selling the device for 159 Euros and shipping within 48h



Once again the Ants are the best in term of price per GH, but the HEX16B2 is very close and with better efficiency.

Software:
Finaly there is a Windows version of cgminer that supports the HEX boards, more info how to run it here: CGMINER Windows build for TECHNOBIT's Boards
You can still use Technobit's special HEXMiner, the driver is in the inf folder. The setup is similar to HEX16A so you can check nemercry's video tutorial for Windows.

As with the previous HEX board I highly recommend that you get one cheap TP-Link TL-MR3020 and flash it with the firmware from Technobit's website. You can also order it directly from them at slightly higher price, but pre-flashed and ready to rock. Of course if you have a linux host it will best to just compile cgminer with the latest patch from Technobit or download my 0.2.2 build for Ubuntu x64 cgminer4_0.2.2

Here is how to compile the 0.2.2 version of the patch
Code:
git clone https://github.com/ckolivas/cgminer.git
cd cgminer
wget https://dl.dropboxusercontent.com/u/8082585/cg/2786526d9f1acb7bd903ece3c822c2c9203aa0b7.patch
git checkout 2786526d9f1acb7bd903ece3c822c2c9203aa0b7
patch -p1 < 2786526d9f1acb7bd903ece3c822c2c9203aa0b7.patch
./autogen.sh --enable-hexminerb
make

Start cgminer with the following line:
Code:
sudo ./cgminer -c ./cgminer.conf
    where cgminer.conf is in the same folder and with your regular settings.



Pros:
  • EU Based
  • Good Efficiency
  • Availability
  • Software voltage control

Cons:
  • No thermal sensor
  • Only 60Gh per device

Conclusion:
This is a great successor of the board, the efficiency of the is competitive, and with the low price for the device itself this is a perfect choice for newcomers and testers not willing to risk thousands of euros for a pre order. Looking forward to test the new Avalon 3 based board from Technobit

Full gallery can be found here: http://imgbox.com/g/wt1xblTddh

best
2GOOD
    [/list]
    6  Bitcoin / Mining software (miners) / CGMINER Windows build for TECHNOBIT's Boards on: April 13, 2014, 09:57:23 PM
    Disclamer: This topic is only for Technobit Boards, for original cgminer support please visit: https://bitcointalk.org/index.php?topic=28402.0

    With the help of "farmdve" from the Bulgarian Bitcoin forum BitcoinBG.eu here it is, the windows build of cgminer supporting Technobit boards like HEX16A2, HEX16B/B2, HEX8A1 etc.

    Step by Step guide:
    Updated: 29.12.2014

    1. Files to download:
    Zadig: http://zadig.akeo.ie/downloads/zadig_2.1.0.exe
    Cgminer: http://bitcoinbg.eu/tools/technobit/cgminer_technobit_win_0_4_1b.zip
    Cgminer Dice Version - Latest: http://bitcoinbg.eu/tools/technobit/cgminer_technobit_win_0_4_1_DICE.zip

    2. Connect the board don't install any drivers if asked


    2.1. If you had installed previous com drivers from technobit the device will be recognized as COM port in device manager:

    Leave it like this

    3. Right Click on Zadig -> Run As Administrator

    3.1. Go to Options and Check "List All Devices"

    3.2. From the dropdown menu find the Technobit device connected


    3.3. Click "Replace Driver", after installation finish click "Close"


    3.4. Check if the driver is installed correctly, choose the board again from the dropdown menu, you should see something like this:


    In device manager it is under Universal Serial Bus devices:

    If you see this than your device is properly installed.

    4. Extract the archive and just run cgminer.exe to test your installation

    4.1 Edit cgminer.conf to suit your needs, the config file is with common settings for all supported devices.
    you need Notepad++ to see linebreaks in cgminer.conf

    5. Run cgminer.exe, if the board is not detected or you get some errors just replug it.

    5.1 /not needed anymore/ In case that the board is still not recognized after replugging the usb cable, try edit the cgminer.conf field corresponding to your board:
    Code:
    "set_default_to_c" : false,

    change to
    Code:
    "set_default_to_c" : true,


    Here we go Wink


    This version is tested and runs on everything from Technobit except HEX16A, you can check my reviews of the boards for settings:
    HEX16A2 (HEXc)
    HEX16B (HEXb)
    HEX16B2 BitFury2 (HEXb)
    HEX8A1 260GH (HEX8)
    HEX8A1 130GH (HEX8)
    HEX4M 400GH (HEXM)
    HEX4R - Spondoolies RokerBox
    HEX16A4 - Avalon 4

    Not tested with mixed boards.

    Cgminer for !!! ONLY !!! HEX16A !!! ONLY !!!
    1. Files to download:
    Cgminer: http://bitcoinbg.eu/tools/cgminer_technobit_win/cgminer-hex16a.rar
    You need to remove zadig for HEX16A boards

    here is a screenshot:


    best
    2GOOD
    7  Bitcoin / Hardware / Technobit HEX8A1 130GH/s Coincraft A1 based miner reviewed on: February 28, 2014, 02:28:27 AM
    The first Coincraft miner from Technobit was HEX8A1 260GH populated with 8 A1 chips. Even though it's a good board, the cooling is very lоud and in my opinion this device is not suitable for home usage or at least not with the stock fans. Apparently Marto & the team acknowledged the need for a quieter solution and since the A1s are very powerful the only way around seems to be cutting their number in half, so here is it the 4 chip version of the board.



    The board itself is identical with the 260GH model, the only difference is the main heatsink and the fans.


    HEX8A1 260GH and 130GH versions side by side

    Performance:
    At the Technobit's site, HEX8A1 is advertised as 130GH miner in turbo mode, so let's see how it handles various settings.



    Indeed with moderate overclock aka Turbo mode the board is hashing with 130GH/s. Let's focus on performance and power consumption. According to Bitmine's pre-production specifications, the chip can deliver 40GH in Turbo mode with power usage of 1W/GH as you can see from chart bellow that is not the case.



    The power supply used for the test is FSP600 50ARN 88+, it is rated to "reach up to 88% efficiency" that's what the second power column is representing Wall power consumption minus 12%, the efficiency of the board is calculated with these numbers. I tried an CoolerMaster B600 (85%) for comparison but it draws more power and was unable to start the board at low 220/850mV. I had similar problems with the 260GH version so it depends on the chips and PSU.

    It is also important to mention that the real chip freq is multiplied by 4 so when you say 250 it's really 1000Mhz core chip frequency.

     

    The board comes with 2 x 6 pin PCI-e power connectors, but according to Technobit's site there maybe versions with only one which seems reasonable.

    Each chip has 32 Engines, you can have 1 or 2 faulty per chip but thats not a problem. If you try to "undervolt" more keep an eye on the Engines if there is not enough juice you will get lower engines which is a good indicator together with the HW errors. In the end it's all about finding the right ratio for your device - freq/voltage. I recommend 960/1000 it's very stable and you will get results from 128 to 132 GH/s depending on your chips, @ 258/1000 you'll get similar results.

    Cooling:
    Compared to the 260GH board I can only say: Blissful silence !!!



    The fans:
    Evercool EC9225M12SA
    Dimensions: 92x92x25 mm
    Power: 1.8 W
    Speed: 2200 rpm
    Air Flow: 40.9 CFM
    Noise: 25 dB

    If you are planing on replacing these with Arctic Cooling F9s I recommend lower settings ie 230-240Mhz. This board is slightly hotter than the 260Gh model, at 260/1000 the temperature of the main heatsink is 55C (close to the chips) at 26C room temperature.

    Mine board comes with rather short treated rods and it is not suitable for stacking, you'll have to replace them with longer so there is enough space between the two back to back fans.

    Note: According to Coincraft A1 specification about 70% of the power is being dissipated through the ground pad and about 30% through the top of the package.

    Pricing:
    With the latest GOX problems the bitcoin price is down. As always investment in bitcoin equipment is risky but let's see what can you order/buy from various mining manufactures. Technobit are selling HEX8A1 for 499 Euros full price which seems normal to me.



    As you can see from the chart the main competitor to HEX8A1 is Bitmain's AntMiner, especially if you live in a country where Customs are not a problem for the rest of us importing an Chinese miner can be a hassle. On the other hand Bitmine are selling fully equipped miner with PSU and everything you need. Even more interesting is the newcomer - The UK based company BitcoinUltra, they have good price and ETA, but no working prototype. The race is on and much more to come from BitFury 2 and ASICMINER with their crazy low price per GH, even BFL can ship something soon - doubt it Smiley

    Software:
    Technobit's HEX line still lags proper mining software for Windows where you can only mine with their special HEXMiner, the driver is in the inf folder. The setup is similar to HEX16A so you can check nemercry's video tutorial for Windows.

    As with the previous HEX board I highly recommend that you get one cheap TP-Link TL-MR3020 and flash it with the firmware from Technobit's website. You can also order it directly from them at slightly higher price, but pre-flashed and ready to rock. In the end you are paying a thousand euros for the miner, so 30 more for the router is nothing. Of course if you have a linux host it will best to just compile cgminer with the latest patch from Technobit or download my build for Ubuntu x64 cgminer4_0.2.2

    Here is how to compile
    Code:
    git clone https://github.com/ckolivas/cgminer.git
    cd cgminer
    wget https://dl.dropboxusercontent.com/u/8082585/cg/2786526d9f1acb7bd903ece3c822c2c9203aa0b7.patch
    git checkout 2786526d9f1acb7bd903ece3c822c2c9203aa0b7
    patch -p1 < 2786526d9f1acb7bd903ece3c822c2c9203aa0b7.patch
    ./autogen.sh --enable-hexminer8
    make

    I start cgminer with the following line:
    Code:
    sudo ./cgminer -c ./cgminer.conf --hexminer8-set-diff-to-one 0 --hexminer8-chip-mask 255 --hexminer8-voltage 1000 --hexminer8-options 8:260
    where cgminer.conf is in the same folder and with your regular settings.



    Pros:
    • EU Based
    • Efficiency - 28nm
    • Availability
    • Software voltage control
    • Half the price, half the performance compared to the 260GH model

    Cons:
    • No thermal sensor
    • Difficult stacking
    • as usual no cgminer/bfgminer for Windows

    Conclusion:
    The efficiency of the board is good, not as good as promised by the manufacturer but still better than most of the miners on the market. I'm pleased to see that Technobit decided to make this version of the board it's a lot more environment friendly. In the end the Bulgaria based company once again did a great job with this challenge and what surprises me the most is that Technobit are shipping before Bitmine.ch

    Full gallery can be found here: http://imgbox.com/g/I9gXuWFlZi

    best
    2GOOD
    8  Bitcoin / Hardware / Technobit HEX8A1 260GH/s Coincraft based miner reviewed on: February 20, 2014, 02:50:38 PM
    In the past months I presented you 3 boards from Technobit and today I'm happy to give you my opinion about the latest build from the Bulgarian Company - HEX8A1.

    The miner in focus today is based on Bitmine Coincraft A1 28nm chip delivering more than 30GH. So far this is the first 28nm chip available for DIY projects and third party designs, and as it seems the board from Tehnobit is the first in production and shipping.



    There are several differences in the design from the past generation of HEX boars, the first thing you will notice is the size of the cooler - it's huge compared to older versions. The board itself is equipped with 8 Coincraft chips, squeezed between two heatsinks and two 92mm fans. Also the molex connectors are replaced with two 6-pin PCI-Express connectors. All of these changes are due to more powerful chips requiring better power modules and cooling.


    HEX16B (BitFury) and the new HEX8A1 boards side by side

    Performance:
    At the Technobit's site, HEX8A1 is advertised as 260GH miner in turbo mode, so let's see how it handles various settings.



    Indeed with moderate overclock the board is hashing with 260GH/s, but the first thing you will notice when this beast is powered on is the noise, we'll get to that later. Let's focus on performance and power consumption. According to Bitmine's pre-production specifications, the chip can deliver 40GH in Turbo mode with power usage of 1W/GH as you can see from chart bellow that is not the case.



    The power supply used for the test is FSP600 50ARN 88+, it is rated to "reach up to 88% efficiency" that's what the second power column is representing Wall power consumption minus 12%, the efficiency of the board is calculated with these numbers. I tried an CoolerMaster B600 (85%) for comparison but it draws around 32W more power at 260/1000.

    At lower settings 230/860 the efficiency is 1.09 W/GH and if you take out the cooling it gets around 1 W/GH for the board itself, of course if we go at lower settings let's say 200/860 we'll achieve even greater efficiency but IMO it's not worth it at least not now, maybe in a year time...

    About the voltage I tried 850 and lower settings but it wont's hash or unstable. It is also important to mention that the real chip freq is multiplied by 4 so when you say 250 it's really 1000Mhz core chip frequency.



    Each chip has 32 Engines, you can have 1 or 2 faulty per chip but thats not a problem. If you try to "undervolt" more keep an eye on the Engines if there is not enough juice you will get lower engines which is a good indicator, although with lower voltage and one or two chips with 28 engines I get some strange (better) results in efficiency perspective. it's all about finding the right ratio for your device - freq/voltage. I recommend 960/1000 it's very stable and you will get results from 255 to 265 GH/s depending on your chips.

    Cooling:
    This thing is LOUD !!! No seriously, it's pretty much a vacuum cleaner. Despite the huge sink the board needs powerful fans to cool down the 8 chips in a small area. According to Technobit the chips need to be close for the chain to work properly so no way around it.

     

    The smaller fan is known from the latest versions of HEX16A2 and HEX16B:
    Sunon PF92251V1-000U-A99
    Dimensions:    92x92x25 mm
    Power: 4.7W
    Speed: 4500 rpm
    Air Flow: 75 CFM

    The big fan is:
    Sunon PMD1209PMB1-A.(2).GN
    Dimensions:    92x92x38 mm
    Power: 12.5W
    Speed: 4900 rpm
    Air Flow: 120 CFM

    Both fans are very dangerous and there are some reports for injured fingers from the previous boards. I'm happy to see that Technobit have taken precautions with the fan grills. The noise is about 60dB at 15cm and 55dB at 1m i.e. LOUD Smiley

    At 260/1000 the sink temperature close to the chips is 46C at 26C room temperature, with the help of a fan regulator I lowered the fan a little bit and the temperature raised to 50C but noise was significantly lower.

    If you are planning to mine at home I recommend to get the new 4 chip version of the board for half the price. It will be equipped with 2 x 2W Sunons and probably much quieter solution.

    Note: According to Coincraft A1 specification about 70% of the power is being dissipated through the ground pad and about 30% through the top of the package.


    Pricing:
    Note: Updated Price Chart
    With the latest GOX FUD the bitcoin price is going down, however I believe that Gox will "fix" their withdraw problem "soon" Smiley As always investment in bitcoin equipment is risky but let's see what can you order/buy from various mining manufactures. Technobit are selling HEX8A1 for 999 Euros full price which seems normal to me.



    As you can see from the chart the main competitor to HEX8A1 is Bitmain's AntMiner, especially if you live in a country where Customs are not a problem for the rest of us importing an Chinese miner can be a hassle. On the other hand Bitmine are selling fully equipped miner with PSU and everything you need. Even more interesting is the newcomer - The UK based company BitcoinUltra, they have good price and ETA, but no working prototype. I assume they will be using A1 chips too but that's only a guess. The race is on and much more to come from BitFury and ASICMINER with their crazy low price per GH, even BFL can ship something soon - doubt it Smiley

    Software:
    Technobit's HEX line still lags proper mining software for Windows where you can only mine with their special HEXMiner, the driver is in the inf folder. The setup is similar to HEX16A so you can check nemercry's video tutorial for Windows.

    As with the previous HEX board I highly recommend that you get one cheap TP-Link TL-MR3020 and flash it with the firmware from Technobit's website. You can also order it directly from them at slightly higher price, but pre-flashed and ready to rock. In the end you are paying a thousand euros for the miner, so 30 more for the router is nothing. Of course if you have a linux host it will best to just compile cgminer with the latest patch from Technobit or download my build for Ubuntu x64 cgminer4_0.2.2

    Here is how to compile
    Code:
    git clone https://github.com/ckolivas/cgminer.git
    cd cgminer
    wget https://dl.dropboxusercontent.com/u/8082585/cg/2786526d9f1acb7bd903ece3c822c2c9203aa0b7.patch
    git checkout 2786526d9f1acb7bd903ece3c822c2c9203aa0b7
    patch -p1 < 2786526d9f1acb7bd903ece3c822c2c9203aa0b7.patch
    ./autogen.sh --enable-hexminer8
    make

    I start cgminer with the following line:
    Code:
    sudo ./cgminer -c ./cgminer.conf --hexminer8-set-diff-to-one 0 --hexminer8-chip-mask 255 --hexminer8-voltage 1000 --hexminer8-options 8:260
    where cgminer.conf is in the same folder and with your regular settings.



    Pros:
    • EU Based
    • Efficiency - 28nm
    • Availability
    • Software voltage control

    Cons:
    • Noise
    • Loud
    • No thermal sensor
    • as usual no cgminer/bfgminer for Windows

    Conclusion:
    Yet another good product from Tehnobit, even that the noise is a huge drawback for most of the miners. The efficiency of the board is good, not as good as promised by the manufacturer but still better than most of the miners on the market. In the end the Bulgaria based company once again did a great job with this challenge and what surprises me the most is that Technobit are shipping before Bitmine.ch

    Full gallery can be found here: http://imgbox.com/g/eKqOvbI9Uv

    best
    2GOOD
    9  Bitcoin / Development & Technical Discussion / QT strange DOUBLE SPEND (malleable) on: February 10, 2014, 01:42:25 AM
    Hi,
    I'm using version v0.8.5-beta, made a regular send and it appears to be a double spend:

    That's the tx I see in the QT:
    https://blockchain.info/tx/41f1cfe70cbbb45ed1efeafed8213cbdee14fe772b8643e0f37259791ce6039f

    as it seems the wallet generates a second tx with the same input/outputs
    https://blockchain.info/tx/22b00c6516676d401e48cc4617ce5cad2b708e0780b72669da9a67deb52d773b

    This is very odd... Huh
    maybe a bug  Roll Eyes
    10  Bitcoin / Hardware / Avalon2 based miner from Technobit - HEX16A2 on: December 03, 2013, 01:13:44 AM
    The first ever board form Tehcnobit was HEX16A - 16 Avalon chips making 7-8GH/s, prety good miner with a great price tag. The HEX16A's successor is here, the new board is codenamed HEX16A2 and is populated with 16 Avalon Gen2 55nm chips. The design of the board is open source and compete for Avalon's design contest.



    The miner looks identical with the other boards from the HEX line, no surprise here. That concept proved to have several advantages like stacking, decent cooling, great power module and 16 chips board is great for the customer as a price point, especially for newcomers that don't have or willing to risk a lot of money for mining equipment.



    Performance:
    At the Technobit's site, HEX16A2 is advertised as 24GH miner, let's see how it handles varius settings.



    @eligius


    Here is a chart with the performance of HEX16A2, keep in mind that the consumption may not be very accurate:
    • 1000/0900mV ~24W - 15.86GH/s - 1.51W/GH (less than 1% HW)
    • 1300/1020mV ~56W - 20.30GH/s - 2.76W/GH (less than 2% HW)
    • 1400/1060mV ~74W - 21.28GH/s - 3.47W/GH (less than 2% HW)
    • 1500/1120mV ~92W - 22.85GH/s - 4.03W/GH (less than 2% HW)
    • 1600/1160mV ~108W - 24.15GH/s - 4.47W/GH (less than 3% HW) - hot
    As you can see the efficiency drops dramatically when overclocked. The power connector of the boards is a standard molex which is rated to deliver upto 132W at 12V, HEX16A had similar power consumption and that was not an issue. However I recommend you to stay bellow 1500Mhz, the hashrate gain just ain't worth it.

    Cooling:
    HEX16A2 is equipped with the same cooling solution as it's predecessor. At higher clocks it runs pretty hot, but nothing to worry about. If you need quiet miner you will have to lower the clocks and switch the fan's connector from 12 to 5V. At 1000mhz the massive heatsink is more than enough to cool down the board even at low fan speeds.

    Pricing:
    HEX16A2 is selling for 299,30€ chips included, which is a good offer for a starter. Compared to the bitfury based HEX16B, they have identical price per GH ratio, but the Fury is more efficient. With the bitcoin price of over $1000 both miners are bargain.

    Here is the updated comparison of the recent products from Technobit along with new 20nm product from KnC:




    Software:
    Technobit's HEX line still lags proper mining software for Windows. You can only mine with their special HEXMiner, which has some improvements in the latest version 1.0.0.3 such as the automatic connection restart - that compensate the memory leak. But still if you connect more boards to the PC you need a lot of CPU power to handle board's work requests. For whatever reason you choose to mine on windows host, you'll need the driver for the board and HEXMiner. The setup is similar to HEX16A so you can check nemercry's video tutorial for Windows.

    As with the previous HEX board I highly recommend that you get one cheap TP-Link TL-MR3020 and flash it with the firmware from Technobit's website. You can also order it directly from them at slightly higher price, but pre-flashed and ready to rock. Of course if you have a linux host it will best to just compile cgminer with the latest patch from Technobit or download my build for Ubuntu x64.



    Pros:
    • Price tag
    • Availability
    • Software voltage control
    • Cooling
    • Stackable

    Cons:
    • no cgminer/bfgminer for Windows
    • no CAN-Bus

    Conclusion:
    Yet another great product from Tehnobit, even that I would recommend the BitFury based HEX16B. To be honest I'm not very pleased with the new Avalon chips. The efficiency is far from great but still better than BFL 65nm. Don't get me wrong, the Bulgaria based company once again did a great job with this challenge. Hopefully in the near future they will solve the issues with mining software under windows.

    Full gallery can be found here: http://imgbox.com/g/e2s0BXsxrf

    best
    2GOOD
    11  Bitcoin / Hardware / Technobit HEX16B - Bitfury based miner in hand on: November 19, 2013, 02:35:56 AM
    The second HEX board from Technobit is ready and hashing. I had the chance to get one of the boards so here is a short summary of the miner.

    Recently I presented you the first bitcoin miner from Technobit: HEX16A - avalon based board with a great pricetag. The board in focus today is very similar and shares the same concept. HEX16B is a 16 chip, BitFury based miner with hashing speed of over 40GH/s



    Technobit already had a BitFury solution, but it was based on c-scape design with stand alone miner and direct LAN connection while HEX16B relies on USB connection and simplified design. The main advantage of HEX16B to S-HASH is the price.
    Here is a comparison of the recent products from Technobit along with November batch pricing from KnC:


    *yes = December delivery for HEX16B



    As you can see from the chart above HEX16B offers a very good price/performance ratio. Just a few weeks ago this offer did not look so appetizing, but with the crazy rally of bitcoin and prices of over $700 the only chance to get on that train seems to be mining.

     

    The board is advertised with hash rates of 40GH/s which is by itself a good result compared to the "original" BitFury boards and their 25GH/s. With the stock settings for the board (540/835mV) the hashrate is exactly 40GH, however the Burnin's Fury is capable of speeds upto 52GH/s. So I gave it a try and with a simple raise of the voltage HEX16B reaches 44GH/s






    Keep in mind that the consumption is measured with NoName "Kill-A-Watt" device.

    I don't recommend changing the bitrate, the results are unstable and sometimes the board "hangs" at 20-25GH/s rates. It needs full power cycle to recover.

     

    You can order the miner either with terminal power connector or with a standard molex one. The board is consuming around 50 watts, almost half of what HEX16As, so no problem with the molex connector for this HEX board.

     

    Cooling:
    HEX16B is equipped with the same cooling solution as it's predecessor. If you need quiet miner you can easily switch the fan's connector from 12 to 5V, the massive heatsink is more than enough to cool down the board even at low fan speeds. However I'm planing to change the fan with Arctic F9 PRO TC and forget the money maker under the bed Smiley

    Software:
    Technobit's HEX line still lags proper mining software for Windows. You can only mine with their special HEXMiner, which has some improvements in the latest version 1.0.0.3 such as the automatic connection restart - that compensate the memory leak. But still if you connect more boards to the PC you need a lot of CPU power to handle board's work requests. I don't know the exact reason for that, but there are reports that with a slow Atom and 2+ boards you can only get around 30GH/s. For whatever reason you choose to mine on windows host, you'll need  thedriver for the board and HEXMiner. The setup is similar to HEX16A so you can check nemercry's video tutorial for Windows.

    As with the previous HEX board I highly recommend that you get one TP-Link TL-MR3020 and flash it with the firmware from Technobit's website. You can also order it directly from them at slightly higher price, but pre-flashed and ready to rock. Of course if you have a linux host it will best to just compile cgminer with the latest patch from Technobit or download my build for Ubuntu x64.

    Pros:
    • Price per GH
    • Software voltage control
    • Cooling
    • Stackable

    Cons:
    • no cgminer for Windows
    • no CAN-Bus

    Conclusion:
    Apparently Tehnobit's trend is to continue the HEX series, as to offer competitive products in this wild race for hash power. Hopefully in the near future they will solve the problem with the software under Windows. I've been told that luke-jr is working on implementing HEX support to bfgminer. In conclusion I can say that we have a great digger, which could be easily put in the bedroom Smiley

    Full gallery can be found here: http://imgbox.com/g/F4zzYCxUZZ

    best
    2GOOD
    12  Bitcoin / Hardware / TECHNOBIT's HEX16A in hand - first impressions / mining software on: September 27, 2013, 03:15:38 PM
    About 4 months after marto74 announced his assembly service for avalon chips I've got my fully assembled bitcoin miner called HEX16A.
    The board is based on TechnoBit's design for 16 chip miner, ordered first week of August for 49,30€ from their online shop.



    My first impression of the board is the massive heatsink that covers the entire backside of the board, together with the huge filter capacitors close to the chips. Those two factors and the improved power supply module helps for the great overclocking capabilities that HEX16A provides. It can easily be clocked to 500Mhz with less than 2% HW errors, that makes the board one of the best on the market.



    TehcnoBit provide their version of cgminer with support for the board and adjustable core frequency and voltage.



    Here is a chart with the performance of HEX16A, keep in mind that the consumption is at the wall and includes PSU CM RS450-ACAA-D3, measured with APC SmartUPS.
      


    Even that 500Mhz per chip is a great achievement the power drawn by the board is quite serious. If we take into account the PSU's efficiency of 85% it turns out that the board consumption is around 105W or a current of ~8.75 A. In my opinion this kind of amperage is too much for a single wire and a molex connector which by the way according to wikipedia has a max current of 11 A/pin (30 °C rise).
    For comparison, ASICMINER's Blade (old version) overclocked to 13GH/s drawns 115W at the wall with the same PSU, that makes 8.84W for GH  



    HEX16A is equipped with 92mm cooling fan but it is lacking temperature control for it. If you value your comfort you can easily switch the fan's connector from 12 to 5V. Of course speeds higher than 400Mhz it is recommended to leave the 92mm fan at full speed. The fan itself is a SUNON EE92251S1-0000-A99 and has a great air flow of  51.5 CFM with low noise levels even at full speed: 34 dBA



    At their online shop TechnoBit offer a preflashed TP-Link TL-MR3020 with the special version of cgminer ready to use with HEX16A.

     

    The router is based on OpenWRT firmware and provides easy to use interface to setup your mining parameters. The limited amount of RAM on the TP-Link has forced TechnoBit's developers to turn off the WiFi completely. Marto confirmed that the firmware will be open source and ready for download on their support site, so it would be great if we can manage to turn WiFi back on and use it as a client for a wireless connection.



    Since this is a linux based router you can SSH into it and access the screen of cgminer with screen -r

    Pros:
    • Price
    • Overclockable to 500Mhz
    • Stackable
    • Cooling
    • did I mentioned price Smiley

    Cons:
    • Single molex connector, even that it's not a problem at lower clocks

    Conclusion:
    I'm very pleased with this board, it has great overclocking potential at affordable price which can help for a faster ROI in the first months. I'm looking forward to see other products from the based in Bulgaria company TechnoBit, they are already working on BitFury and BFL based boards .

    All pictures can be found here: http://imgbox.com/g/eG0aq12mlq

    best
    2GOOD


    Edit:
    cgminer / hexminer tutorial: https://bitcointalk.org/index.php?topic=303538.msg3371198#msg3371198
    13  Economy / Goods / [WTS] 16 BFL chip credits on: July 08, 2013, 05:38:15 PM
    Hi,
    I have an early Little Single order and I get a discount for 16 chips from BFL. The discount is for 25$ per chip or a total of 400$

    I'm willing to sell the vaucher for 3.20 BTC (around 250 USD).

    Escrow is OK

    14  Alternate cryptocurrencies / Altcoin Discussion / Bytecoin stuck at block 14203 on: April 08, 2013, 08:05:06 PM
    Client stuck on: "blocks" : 14203

    I can see that one of the pools is there too: http://pool.bytecoin.in/stats_netw.php

    http://blockexplorer.bytecoin.in/

    Interesting phenomena, fork ?! Aprils Fool Smiley

    Edit: client states Out of sync
    15  Economy / Auctions / WTS 5 ASICMINER shares on: March 14, 2013, 10:49:05 AM
    I'm selling here 5 asic miner shares in full so u bid for the 5

    Start bid per share: 0.90 BTC
    Step: 0.01 BTC
    End: Saturday, 16 March 2013, 23:59:59 (GMT)

    Happy Bidding!
    16  Other / Meta / What about some rules ?! on: December 16, 2012, 06:40:22 PM
    Hey, what about some rulles for selling and buying stuff around here.

    For example some basic rules:

    Item Description:
    Price:
    Escrow: Yes/No/Maybe
    Item Location:
    Shipping to:


    The last two are very important, most of the topics are without item location and shipping options.

    Let somebody with native English write some rules make the topic sticky and we all follow them.

    Edit: this can work for the whole marketplace forum...
    17  Other / CPU/GPU Bitcoin mining hardware / MSI 5850 (ref) Volterra problem on: December 13, 2012, 09:25:04 PM
    Hi,
    I bought this card as faulty several months ago, First run - it starts, but there was a very strange noise from the mobo's speaker. Then I noticed that one of the voltera's Capacitors was blown away (see pic1). I had to do a bridge for re soldering the new Capacitor as the pcb path was missing anyway this was done and now the card works without the creepy speaker noise from the mobo. The problem is that when you load the card VRM 1 starts overheating to extreme while VRM 2 and 3 stays cold, but eventuaaly gets heated by the PCB and cooling plate. At stock freq/voltage VRM gets above 140C in no time and card shutdown itself. I managed to get it to stable values for mining at the lowest 0.875 V and 430Mhz (177MH/s  Grin) the VRM stays around 109C and that way the card is stable and mining for more than 4 months without a glitch. It can go higher freq, but the VRM gets too hot, more than ~120C

    Quote
    Device [1]: Cypress [Radeon HD 5800 Series]
            Current core voltage: 0.8750 V
            Presets: 0.8750 / 0.8750 / 0.8750 / 0.8750 V
            Core power draw: 68.81 A (60.21 W)
            VRM temperatures: 109 / 58 / 50 C

    IMO there are two possible scenarios here
    1. VRM 2 and 3 are not working at all and the power is driven by VRM 1 which can't handle the full power requirements of the chip.
    2. VRM 1 is shorted or just faulty and thats why it overheats.

    What is your oppinion, now that the GPU mining is going to end I have more time to experiment with this.





    Not actual pictures

    Edit: I remember now that same Capacitor (pic1) was desoldered for VRM 3 too.


    P.S.
    ===
    This is not a cooling problem Wink
    18  Economy / Computer hardware / [WTS] BFL ASIC SC early pre-order 2xJalapenos on: November 14, 2012, 03:19:23 PM
    Hi,
    Selling here pre-order for 2xJalapenos order date is 2012/07/02

    Since this is a first month order, even the first half of that month there is a good chance you will have it with the first wave of shipment by BFL.

    Minimum sell price is 50.70 BTC (the price I paid)

    Any offers above that are accepted in PM or post here till 23:00 UTC on Sunday, 18 November 2012.

    I can send you screenshot of the order, and when I receive the coins will email BFL to change the shipping address and name. You will get the reply together with the bit-pay receipt.

    Thank You
    19  Economy / Services / Looking for a SeedBox with SSDs on: November 06, 2012, 07:10:08 PM
    A friend of mine is looking for a seedbox provider accepting bitcoins...

    It must be:
    Located in Europe
    Gigabit
    FAST SSD drives

    Thank you.
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