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I've got another fury coming this week so I'll take all kinds of measurements on it and post some pics with the values. Hopefully this will help the collective until we find schematics.
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If it's the fastest, it's likely only due to the cooling mods I've done to it by adding just a little more thermal paste to the back of the circuitboard and adding the heatsinks to the IC's on the top. It does run cool now with the small fan blowing through the inside of the case...temp probe still reads 80f on the heatsink. I may try to move it to an empty spot on the circuit board sometime today and see what it reads on the board itself.
Btw...Hashra only goes to 350Mhz clock speed. Not sure if it can be manually specified higher than that or not....I was looking through some of the file last night but didn't really find anything. If the temps on the fury really are only around 80f as read by the heatsink....I have no doubt we could probably push the speeds a little higher without even touching the voltages.
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Well, I've added the thermal paste to the back, applied heatsinks to all IC's on the top, and there is a fan blowing air through the case over the heatsinks I applied. Ambient temp is around 73f. Temperature probe attached to the side of the case/heatsink reads 82f. I hadn't known about the higher speed information...however....for kicks I started it running at 350 over 2 hours ago. Right now it's sitting at 1.39Mhs and around 4% error.  |
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Thanks! Updated the first post with the links, 2nd post with the technical information.
Hopefully we can tweak these Fury/Blizzard units to get more out of them like the gridseeds.
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*Reserved* Technical info:" Zeus scrypt chip’s software implementation" doc http://zeusminer.com/user-manual-ver-1-0/From the doc we know the chips have 8 cores. Also it indicates the hash rate is approx 70% of the clock rate if "--nocheck-golden" is used. So 340 clk would equal 238kh/s per chip x 6 chips for the Fury = 1.4mh/s approx 328 clk would equal 230kh/s per chip x 6 chips for the Fury = 1.377mh/s approx Readcount Timeout is explained as: 4.3 Readcount Timeout
After we send one command packet to the chained chips, that BIG chip will cover all the 32 bits nonce in a certain TIME. So we must send a new work to it before that, otherwise its hash power is wasted.
Cgminer’s readcount timeout is used for that. Every count means 0.1 second. We now set the readcount to be 3/8 of the covering time. It may be 3/4 later.
-------------------------------------------------------------------------------------------------------As for IC's.... 2R030 PEM 1349A6 4214 This looks like it may be it: http://www.nxp.com/documents/data_sheet/PSMN2R0-30YL.pdfThe other chip that looks to control the voltage is marked with: 0193 391 CCON Looks like this may be the IC in question: http://www.ti.com/lit/ds/slus719e/slus719e.pdfhttp://ca.mouser.com/ProductDetail/Texas-Instruments/TPS40193DRCR/?qs=kcKC6WcubkU/HLcVuupS9g==Silicon Labs USB to UART bridge: http://www.silabs.com/Support%20Documents/TechnicalDocs/CP2102-9.pdf-------------------------------------------------------------------------------------------------------
------------------------------SCHEMATICS ...!!! (Thanks Zig!)-------------------------------------------
-------------------------------------------------------------------------------------------------------http://zeusminer.com/wp-content/uploads/2014/06/BLIZZARD_X6Chips.pdfalternate link: https://www.dropbox.com/s/r9i4n8o2yhsqfh8/BLIZZARD_X6Chips.pdfBlizzard and 32-chip Schematics (Thanks happydaze!) http://zeusminer.com/shcematics/ (ok....did anyone else realize that schematics is spelled wrong?  ) Zeus ZMC230 datasheet! (Thanks Zig!) Direct Link: https://mega.co.nz/#!t54SgYIR!_WzDmy7SuwVurOdWZUIRnNh93C3lSJ_6bUld-BJdlsMAlso here at the very bottom of the page: http://zeusminer.com/shcematics/-------------------------------------------------------------------------------------------------------
------------------------------MOD INFO (Thanks J4bberwok!)-------------------------------------------
-------------------------------------------------------------------------------------------------------In the formula from the datasheet, R7 is th resistor I have swapped, R8 is just under it on the PCB with 93A marking R7=0.591xR8/(desired voltage-0.591) 5.6K gives 1.57v 6.2k gives 1.48v 6.8k gives 1.4v 7.5k gives 1.3v 8.2k gives 1.26v I measured a bias of +5% on my board. I haven't measured the R8 out of the board, but if it's slightly out bu 4 or 5% it could be the reason. 1.65v for undervolting, if you want less power draw 10k gives 1.14v 11k gives 1.09v 12k gives 1.05v 13k gives 1.01v Changing the R8 will also work don't touch the 9.1k one, replace the 93A labelled one 10k gives 1.24v 11k gives 1.30v 12k gives 1.37v 13k gives 1.44v 15k gives 1.57v for undervolt 6.2k gives 0.99v 6.8k gives 1.03v 7.5k gives 1.08v 8.2k gives 1.12v picture to clear things up   -------------------------------------------------------------------------------------------------------The chips are 8mm x 8mm.  |
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I'm starting this thread mostly because there isn't one for it already with the aim to get more from our Fury's/Blizzards (all based on the Zeus chips). So here's some links to get started: A WIKI! http://wiki.zeusminer.info/index.php/Main_Page : Thanks LongAndShort! Link to Silab's for Windows USB driver: http://www.silabs.com/products/mcu/Pages/USBtoUARTBridgeVCPDrivers.aspx*Above was taken from http://wiki.zeusminer.info/index.php/SoftwareDocumentation as well as user experimentation has shown that Zeus hardware prefers higher difficulties as compared to Gridseed. Using difficulty values of 1024 or 2048 are not unheard of for use on a single Fury/Blizzard and offer good results. Link to thread that has a growing list of pools which support the manual setting of difficulty: https://bitcointalk.org/index.php?topic=645532.0 (Thanks jekv2!) Zeusminer page with links to cgminer binaries, sources, windows drivers, and rpi images: http://zeusminer.com/user-manual-ver-1-0/Builds of cgminer with Zeus support:The zeus version of cgminer base on cgminer 3.11 https://github.com/zeusminer/cgminer_zeus (Thanks happydaze for the link) GAWMiners support page for cgminer source and binaries for the Zeus based hardware: https://gawminers.zendesk.com/hc/en-us/articles/202184744-cgminer-source-and-configUpdated build(s) of bfgminer with Zeus support: Link to file: https://github.com/Darkwinde/bfgminer Link to thread: https://litecointalk.org/index.php?topic=20477.0 (Thanks worldlybedouin for updated link) Link to file (Windows binary): http://sgminer.builders/ Link to Sources: https://www.dropbox.com/sh/fygluxm446cjctn/AAAFUAJDeIEYiWnuEefimKjWa Link to thread: https://hashtrader.com/t/bfgminer-fork-supports-for-zeus-miners/354/4 Link to litecointalk thread: https://litecointalk.org/index.php?topic=16301.5760 Link to Nwoolls' bfgminer: https://github.com/nwoolls/bfgminer/tree/feature/zeusminer-support-cleaner Link to Luke-jr's bfgminer: https://github.com/luke-jr/bfgminerTo start mining, run: Code: bfgminer --scrypt -S zus:all -o host:port -u username -p password If you have more than 6 chips, use: Code: bfgminer --scrypt -S zus:all -o host:port -u username -p password --set zus:chips=6 To set the clock, use: Code: bfgminer --scrypt -S zus:all -o host:port -u username -p password --set zus:clock=340 Finally, there are a few ZeusMiners with buggy firmware that don't properly respond to detection. For those you may need to use: Code: bfgminer --scrypt -S zus:all -o host:port -u username -p password --set zus:ignore_golden_nonce=1 No CPUMiner support yet. Raspberry Pi images:Hashra Lunar Lander : * Support Page: http://hashra.com/support/* Direct link to image: https://mega.co.nz/#!D1QFmBpL!scLfSE3782eFOv4At6KAcZv-x0rr_Vgxe-1pD8T8P0o* Default Login Username: hashra * Default Login Password: hashra * Root access to firmware: * User: pi * Password: controla Starminer:* Litecointalk thread: https://litecointalk.org/index.php?topic=19129.0* Direct link to image download page: http://sourceforge.net/projects/starminer/files/* There are two user accounts for StarMiner, root and pi. Both have the password of live. (Listed on the Sourceforge Wiki "Getting Started" for Starminer) MinepeonUses bfgminer (which is making rapid progress with the zeus based miners) * Link to "main page": http://minepeon.com/index.php/Main_Page* Username: minepeon * Password: peon MinerEU (ScriptA)* Download + instructions: https://github.com/MinerEU/scripta_a2/tree/zeusZenminer:* Here's the webpage: https://zenminer.com/Info below provided by thebotnet - Thanks! If anyone would like to use the zen os on their pies then here is a quick guide. 1. Download the zen os image from this guide put together by zenminer. * * * https://docs.google.com/document/d/1UilAJ3wMOgoHFqz9e1zhOvz79KQDascYaC6Aq3sbmqg2. Write it to your raspberry pi's sd card using win32 disk imager (or your preferred method) 3. Boot the pi with Ethernet and the miners plugged in (or plug them in at a later time, up to you) 4. Go to https://zenminer.com/LogIn/ and click on "Don't have an Account?" then sign up and sign in 5. Click the add miner button and it should show up, it may take a while for it first to show up but it will (also try refreshing) Remember this guide is for people that want to use their own raspberry pi hardware and dont have an activation code that came with the zenminers.
Minera (as of version 3.0.0) * Official site* https://github.com/michelem09/mineraBasic cgminer command (as if it's really that much different than what we're all used to anyway): cgminer.exe -o stratum+tcp://us.clevermining.com:3333 -u 1FC7cRPFXUXpgGoduMy1EZcA86zbQAaPKW -p x --nocheck-golden --chips-count 6 --ltc-clk 328 -S //./COM4 Example json config file ( base config file is from starminer with minor additions). {
"pools" : [
{
"url" : "stratum+tcp://stratum.nicehash.com:3333",
"user" : "16LfWJ6pvica3PrfgR4HVSVrr2wMWBy2RL",
"pass" : "d=32"
},
{
"url" : "stratum+tcp://ny.clevermining.com:3333",
"user" : "1FC7cRPFXUXpgGoduMy1EZcA86zbQAaPKW",
"pass" : "x"
}
],
"api-listen" : true,
"api-port" : "4028",
"expiry" : "120",
"nocheck-golden" : true,
"chips-count" : "6",
"ltc-clk" : "328",
"log" : "5",
"no-pool-disable" : true,
"queue" : "9999",
"hotplug" : "5",
"scan-serial" : [
"/dev/ttyUSB0",
"/dev/ttyUSB1",
"/dev/ttyUSB2",
"/dev/ttyUSB3",
"/dev/ttyUSB4",
"/dev/ttyUSB5",
"/dev/ttyUSB6",
"/dev/ttyUSB7",
"/dev/ttyUSB8",
"/dev/ttyUSB9"
],
"scan-time" : "30",
"scrypt" : true,
"verbose" : true,
"shares" : "0",
"kernel-path" : "/usr/local/bin",
"api-allow" : "W:127.0.0.1",
"api-description" : "cgminer v3.1.1-zm"
}
I've seen it mentioned over on litecointalk forums that if you increase the clock speed to 336 and use a higher difficulty the error rate will go down. I can understand the difficulty having an effect, but not sure about the clockspeed. I'm still experimenting with that. -------------------------------------------------------- As for mods....they're now in the thread and some technical details in the 2nd post ***DO NOT ATTEMPT IF YOU CANNOT ACCEPT RESPONSIBILITY SHOULD SOMETHING GO WRONG***I noticed that while the Fury is hashing away, the heatsink wasn't THAT warm...but the tops of the chips were too hot to touch for very long at all. So, I took it all apart. 6 screws hold the circuitboard in place on the heatsink. Another 4 hold the fan down. 10 screws and you're circuitboard has the freedom it needs. First thing I noticed was that there was thermal paste on the back...but not much....at all....in fact...there wasn't even any on the heatsink after removing the circuitboard. So that's #1 on the list. I applied thermal paste (Arctic Silver Ceramique - USE NON ELECTRICALLY CONDUCTIVE PASTE ONLY) to the backside of the circuitboard behind each of the ASIC chips as well as the mosfets, choke, and the other coupe IC's. After a test run I noticed that the heatsink was noticably warmer...which was good since more heat is being transferred to the heatsink from the board. Seeing as the ASIC chips were still REALLY hot to the touch, I cut up a larger heatsink and applied heatsinks to each IC on the board as well as all parts of the power circuitry. Image of the cooling mod. (forgive the look of the heatsinks...I had a hell of a time with it...but they do the job.)  Do note that there is only about 7mm-8mm of real clearance between the circuit board and the case. The heatsink I had cut up was 5mm high. I also bent the fins a little so they were spread farther apart and not just standing straight up. :EDIT: After 3 full days of testing with the application of Arctic Silver Ceramique and the added heatsinks to all IC's on the board, I can run stably at 350Mhz with a 4% error rate (screenshots are in the thread).See the following posts for examples of fan mods... (Thanks Ktulu1 for compiling the list!) https://bitcointalk.org/index.php?topic=644921.msg7304782#msg7304782https://bitcointalk.org/index.php?topic=644921.msg7354916#msg7354916https://bitcointalk.org/index.php?topic=644921.msg7371079#msg7371079https://bitcointalk.org/index.php?topic=644921.msg7543334#msg7543334Also note there are numerous test point locations with voltages silkscreened next to them. I'm just making an assumption here...but the 1.2vc would indicate a test point for the Core voltage which should read 1.2v. I measured this point and got 1.26v. "Fan lubrication mod" (not Zeus hardware specific but good to keep things running smoothly for as long as possible... Thanks jekv2 for the suggestion!) Link to thread describing mod: http://www.overclock.net/t/773256/prepping-a-sleeve-bearing-fan-for-work1Link to oil mentioned: http://acehardwaremaldives.com/product/auto/10705/So....any other mods? Suggestions? Tuning tricks? I'll keep the first post updated as best as I can with notable information that's contributed. :Edit - added Zeusminer links |
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-snip-
Anyway...here's a pic where you can see the voltage test points and added heatsinks.
What happened to your heatsinks? It looks like they got run over by a truck... LMAO! Well...yes and no....I had a fight with them. They weren't agreeing to be cut up and it was the last heatsink I had of that variety that would fit with the height I had to work with. Busted my last dremel cutoff wheel, so had to resort to the air powered metal saw I have...which the blades aren't that great for. Didn't have a vice hear it, so I has holding the heatsink with pliers and a death grip. In the end though...it's not the looks but the functionality I was after, an the scratches and marks just add to the effective surface area. I measured the 1.2vc mark and it reads 1.26v. So if the chips were originally spec'd at 1.3v, there's some room to play with. As for IC's....I don't have a camera other than the one on my htc....but around the choke are all the same type of mosfet with the markings: 2R030 PEM 1349A6 4214 The other chip that looks to control the voltage is marked with: 0193 391 CCON Since this is a Fury, there are NO markings on any of the ASIC IC's themselves. The only other IC with markings is the Silab's USB interface - which from my understanding can support up to 1Mbps transfer rate however the Fury/Blizzard have it limited to 115200Kbps (could there be some performance gained by upping this limit?? It appears that the chips themselves are daisy chained to a nonce solved by the last chip in the chain has to travel through each chip before it and then to the interface....it could be possible that more data is flowing through the port than 115200Kbps can effectively handle I suppose). :EDIT: So it looks like the 0193 chip is possibly this TPS40193: http://www.ti.com/lit/ds/slus719e/slus719e.pdf |
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We should start a new Fury/Blizzard thread for those of us with those devices. I thought about doing it, but haven't had the chance to really sit down and compile the information and stuff. These things do run hot, and if you look at the circuit board, there are some test points with voltage markings next to them. I have a good idea that the points are labeled for core voltage, bus voltage, etc. If you check some of the pics on this link you can see in the upper left there is a point labeled 1.2vc...I would assume that stands for 1.2v core. There are some other points on the other side of the board labeled 3.3vb and two labeled 1.2vb. I haven't measured them yet though. So far I've been trying to reduce the number of errors with settings and cooling. I found some discussion on litecointalk where they mentioned that the speed 336 combined with higher difficulty reduces the number of errors. I set the speed to 336, and at least on Manicminer pool the diff is set to 256 (or close to it) and so far out of 650 accepted shares, I have 29 hardware errors and 0 rejects (4.4%?! if my math is right...I'm tired as hell) I also added some extra cooling. The back of the board is smeared with a VERY thin layer of thermal paste...and it actually was making hardly any contact with the heatsink. They should have used more paste or a thermal pad. So I put dabs of paste on the backside of the board where the chips are, and added some heatsinks to the tops of the chips as well as the mosfets. After the added thermal paste on the backside of the board the heatsink is noticeably warmer indicating more heat is being transferred to it from the board....so that's good. The heatsinks on the top of the chips don't do a lot of good by themselves unless there's a fan pushing air through the case over them but that's for another time. I have a second Fury coming so I could slap them together and make sort of a blade configuration with a fan on one end blowing over all of it. Anyway...here's a pic where you can see the voltage test points and added heatsinks. |
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Is the POT network tanking? I checked some other pools and they all show the POT pool is closing. Poolto.be, blockchaser, pot.hashfast.de, etc...
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As per question above, what happened to POT? I requested payout of 0.2 BTC worth and have not received?
Same here....I submitted the transfer 30 minutes ago...and nothing has come through. |
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What happened to POT coin? It just dropped out of existance on Manic...no news, no warning, anything... I transferred my wallet...but does anyone know what's going on?
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Would it be possible to add hotplug support to cpuminer-gc3355? It already has autodetect...I would assume (rightly or not) that hotplug would simply be an extension of the autodetect feature on a variable timer.
That way you could add/remove mining hardware without having to restart the whole process.
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Is there an option to see the current difficulty the miners are at on the pool?
Also, no matter what I do, if I enable logging it doesn't work. The miner freezes, the dashboard just sits there with the rotating icons. If I disable logging, it all starts working again. Permissions issue? It's a fresh install of Ubuntu 14.
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I had just done a fresh install of Ubuntu and minera yesterday and all was working fine. Unfortunately I was using a test machine with an old drive and we had a power flicker over night and the drive didn't work after that.
I replaced the drive and just did a fresh install of Ubuntu this morning, followed all instructions to a T to install minera. Did everything exactly the same as I did yesterday. And minera doesn't work and neither does mining.
The gridseeds are fine, network is fine, it's something to do with minera as I pulled down the cpuminer-gc3355 from github, built it, and am able to run it manually and it works.
After minera is installed fresh, I change the settings to reflect the pool I'm using, speeds, and other settings. Save. Start Miner. Then I get the message it's unable to get stats.
It does this no matter what I do. I even copied the minerd that was freshly built from the cpuminer-gc3355 git to the minera-bin/minerd and get the same results.
If I run minerd manually and specify the minera_conf.json I get a core dump message.
If I edit the minera_conf.json and remove ONLY the logging line, then it seems to work ok - but only if I run minerd manually. Removing the logging from within the minera interface doesn't seem to resolve anything.
I haven't checked the application logs yet, just thought I'd throw my experience in here and see if anyone had any suggestions.
First of all, did you overwrite the minera-bin/minerd file with that for Ubuntu 64bit? I don't think there is a binary for Ubuntu in cpuminer-gc3355 git page (that's for RPI a different architecture) Yes, that's the first thing I did. When that didn't work, then I cloned the cpuminer-gc3355 and built it, then copied that over the minera-bin/minerd with the same results. I did try running minerd manually and specifying the --log=./log.txt as well as --log=log.txt and both cause minerd to just freeze. I'll mess with it later this weekend if I have time. Right now minera works to display stats ONLY if I start minerd manually without the log function. |
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I had just done a fresh install of Ubuntu and minera yesterday and all was working fine. Unfortunately I was using a test machine with an old drive and we had a power flicker over night and the drive didn't work after that.
I replaced the drive and just did a fresh install of Ubuntu this morning, followed all instructions to a T to install minera. Did everything exactly the same as I did yesterday. And minera doesn't work and neither does mining.
The gridseeds are fine, network is fine, it's something to do with minera as I pulled down the cpuminer-gc3355 from github, built it, and am able to run it manually and it works.
After minera is installed fresh, I change the settings to reflect the pool I'm using, speeds, and other settings. Save. Start Miner. Then I get the message it's unable to get stats.
It does this no matter what I do. I even copied the minerd that was freshly built from the cpuminer-gc3355 git to the minera-bin/minerd and get the same results.
If I run minerd manually and specify the minera_conf.json I get a core dump message.
If I edit the minera_conf.json and remove ONLY the logging line, then it seems to work ok - but only if I run minerd manually. Removing the logging from within the minera interface doesn't seem to resolve anything.
I haven't checked the application logs yet, just thought I'd throw my experience in here and see if anyone had any suggestions.
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Hi Guys, Maybe this will help someone that had the same problem I had.. I don't know if you remember a few posts back I found 2 pods and the fans were not spinning. I did not even notice this for awhile , only green light is on. I opened them both and they both had the exact same problem FB23/24 were burnt up and the pads were ruined and I believe it was a bad plug, i was one of those splitters so I ended up throwing it out after my testing. Anyhow so I ordered 10 FB's and tried to replace the FB's , it was VERY VERY hard as the boards were damaged as-well as the contacts anyway I managed to do it 1 Pod at a time and re-plugged it in AND POOOOF again FB23/24 blown 5 seconds later, So I tried the other pod same thing happened 5 seconds later , this is now 4 FB's blown. They were cheap so I didn't really care that much. Now I wanted to test some spare plugs that I had, So I tried again x 2 pods and blew again! That's 8 out of 10 FB's now gone... Anyway I noticed the other pod that blew seemed to only blow 1 FB out of the 2 so I used 1 good one on that other pod to try yet ANOTHER plug but this time I used a good plug that was working with a working POD , NOPE Again blew it. SO I started asking questions to Gybh and Amix , great help! Both Guys!! They have had experience and they hinted that it may be a faulty mofset, But my mofset was working at the start and it did not look like it was blown it looked good, I started to think maybe the bad plug made it faulty by driving too much current through it not enough to blow it but enough to stuff it up on the inside. Anyway So I started shopping for mofsets , I followed a link given to me which had the mofsets I needed on there and the great part about this company is you can order samples for ABSOLUTELY FREE But only 3 maximum and FREE delivery . I ordered 3 mofsets as samples which is the maximum for samples, but I only needed 2 remember  , well they came in 2 days from US to AUS.. AWESOME ha!!?? SO I had the mofsets in my hand and I Had 1 more NEW FB and was able to find yet another good looking FB that was from the other blown pair of FBs it seems that since they are so close together one out of the 2 sometimes blow and blast the other one of its pads but its actually still good to use as I am about to find out....so it seems like I had 2 good remaining FB and the mofsets, this means I can atleast try to repair 1 of the 2 broken pods= perfect!!!! If this works all I will do then is buy another few FB and I am set! So yesterday night I decided to play and at-least try to repair 1 out of the 2 broken pods. Anyway I was told by someone to take off the bottom heat sink as this takes the heat away from the hot air gun and it will be hard to remove the mofset if you don't , But the problem is I forgot about this and just got into it straight away , well it was a NIGHTMARE TO TAKE off old mofset, I basically took it off in broken chunks! I was picking at it and heating it at the same time breaking it bit by bit until it all came off LOL it just would not melt off properly!! Anyway I got it off eventually, rough as anything and soldered the new mofset in its place, was not easy either as I had to make sure one side of the was not shorting out on the mofsets legs, the other-side is easy as its one contact pad, anyway I did it very roughly but made sure its all contacting and no shortage anywhere << this is the main point...Annnnnnd because the 2 fb23/24 burnt up the board and the pads were practically non-existent.. I decided to do what Gybh did with his pod, solder FB23 on top off FB24 , well guess what? you are going to freak out looking at the pics hahah but I did it!!!!! And to my amazement it works just like the other working pods hahaha !! check out these rough ROUGH pics.. https://www.dropbox.com/s/38bw9pr18n8lv15/20140522_015626.jpg <<<< AY atleast it works and mining away right now:P AND.............. https://www.dropbox.com/s/eqn3pixohfcmu88/20140522_015753.jpg.... Now I only need 2 more FBs to do my last broken pod I already have my awesome Mofsets 2 x left and my FBs are on the way. Wow...that's some bad damage to those FBs. That's awesome that the mosfet I linked you works though. TI makes high quality stuff and I love their samples program. I've used it for the past 20 years ever since I was in college. Comes in handy a LOT! Glad you got at least the 1 pod working. All 5 chips hashing away? After I repaired mine I have 1 out of 5 chips that seems to throw errors no matter what speed it's at. |
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I actually went back after I took that picture and slid a little heatshrink over the resistor/wire to insulate it better. I'd highly recommend doing this if you go that route as it will prevent any accidental shorts against the inside heatsink. Also, just for reference the resistors I used were mostly 39 Ohms. I may have had a couple 45Ohm in the mix, but it lowers the fan speed enough that it still blows a good amount of air but isn't as annoyingly loud as the straight 12v. Heatshrink is a good idea to insulate that hazard waiting to happen, I had thought of placing a heatshrink on the axial resistor (VMOD3) but decided against for now. As for the fan ripping away, I have stowed them miners away in a ventilated cabinet which takes away some of the noise. Power wise there's not a lot saving from the slower fan, so since the noise factor is reduced, I don't mind them running full speed for now. I was planning to put a 39ohm too after seeing yours but a 1/2w with the heatshrink, but I guess I will let the fan blow full speed until I figure a heatsink for the MOSFET's. I dug out some TO-220 sleek heatsinks, will see if it will work, or will order some like chanbergs (saw some on Amazon sold by cosmos in a bag of 20s). BTW, did you use adhesive thermal paste or thermal pad to stick the modded heatsinks over the MOSFETs? I actually just used a very small dab of Arctive Ceramique and let it set. Once it's been run through a cycle of hot/cold it seems to hold very good. I have the same Ceramique that has been holding a heatsink on the cpu of a lan card for years, the lan card stands vertical and even without glue the Ceramique holds the heatsink on it. |
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Hey, is 'any frequency' supported in the latest version of cpuminer, ver 1.0c ?
I presume any frequency means you can step it at 1Hz increments too?
Thanks
It seems to be. I have one of my miners at 1170Mhz. |
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Indeed chanbergs heatsinks are cool.
nst - you gotta love them Dremel - handy for tinkering! I will dig out my stash. I like what you have done to drop fan speed, very safe!
I actually went back after I took that picture and slid a little heatshrink over the resistor/wire to insulate it better. I'd highly recommend doing this if you go that route as it will prevent any accidental shorts against the inside heatsink. Also, just for reference the resistors I used were mostly 39 Ohms. I may have had a couple 45Ohm in the mix, but it lowers the fan speed enough that it still blows a good amount of air but isn't as annoyingly loud as the straight 12v. |
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