@ 21BTC with escrow
But I a miner outside of US. I am willing to pay the shipping fee to China .
And also, The 5Gh/s BFL miner can be shipped to my friend in USA, he is a working staff of UN.
There's another auction here. https://bitcointalk.org/index.php?topic=231571.0Thanks for u. I see u bid another BFL miner at 19 bitcoins. yeah, I can afford max 20 BTC for the jalapeno. |
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I know requested minimum bid 20 BTC, but as no one has started bidding public yet I'll kick it off.
I'll bid 10 BTC - who wants to up the ante?
ok 11 BTC look above you, it's already at 21 BTC |
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@ 21BTC with escrow
But I a miner outside of US. I am willing to pay the shipping fee to China .
And also, The 5Gh/s BFL miner can be shipped to my friend in USA, he is a working staff of UN.
There's another auction here. https://bitcointalk.org/index.php?topic=231571.0 |
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Since the board comes with an ethernet port, DDR, FLASH, etc., the next part of the project would be to instantiate a small Microblaze CPU and load Linux off it and make this board a stand alone miner.
And when you'll get a miscompare you won't know whether the fail was in the hasher or in the CPU. The CPU will be in a different clock domain, in which all timing specs are met. |
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I am interested! Good luck
Please let me know if you need any info or help. Thanks |
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This sounds like a fun project.
I will forward this to a few persons.
Thanks! |
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Excellent question. That is a single board for $1695 which contains a single Xilinx XC7K325T-2FFG900C (326K logic cells total) + lots of additional circuitry (ethernet, flash memory, DDR SDRAM, LCD display, lots of connectors, etc.) The Raspberry Coins - CM-1 board contains two Cyclone V-A9 devices (301K logic cells each), for a total of 602K logic cells. The interface is via Raspberry Pi (SPI port). So, CM-1 board is significantly simpler, and you get much more logic cells per dollar. Both the Kintex-7 and the Cyclone V are 28 nm technology. Cool, thanks for the clarification. Makes sense. Altera seems much for value for money. Any idea about the power draw of the V-A9 FPGAs while hashing? |
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Since the board comes with an ethernet port, DDR, FLASH, etc., the next part of the project would be to instantiate a small Microblaze CPU and load Linux off it and make this board a stand alone miner.
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It would be nice for someone to join me in developing bitstreams for Kintex-7 FPGAs. I have used the open-source FPGA code with the 7K325T-2 device on KC705 board and have programmed it to hash at 600MH/s (600MHz) with ~30% device logic usage using fpmaminer's code that uses almost all the DSP blocks on this FPGA. Please PM me if you want this bitstream / source code.https://github.com/fpgaminer/Open-Source-FPGA-Bitcoin-Miner/tree/master/projects/KC705_experimentalThe board costs ~1700 USD + tax from Avnet and has support for external DDR3 RAM which could potentially hash scrypt, though it's a speculation at this moment. The board also comes with a full seat of ISE + Vivado locked to this FPGA. The chip and Vccint VRM of this board heats up a fair bit at that clock speed, but if kept near an AC vent the device runs stable for many days. Another user has suggested using VGA memory heatsink blocks on the VCCint VRM inductor. I will try this as soon as the heatsinks arrive. The first order of business would be to instantiate another set of hashers so that we can get towards full device usage and monitor power consumption, and heating issues if any.
This way we can try to reach ~1GH/s and more on a 28nm FPGA board with good availability. If you fulfill any one of the following, and have some spare time at hand, it would be great if you could join me in this project. a) Ownership of a Xilinx KC705 board. This is a decent FPGA board with a 7k325 -2 FPGA b) Xilinx Vivado tool / ISE tool running c) Fluency with HDL code. Some leads to start from https://github.com/fpgaminer/Open-Source-FPGA-Bitcoin-Miner/tree/master/projects/Kintex7_160T_experimentalhttps://github.com/fpgaminer/Open-Source-FPGA-Bitcoin-Miner/tree/master/projects/VHDL_StratixIV_OrphanedGland/sha256/rtl PS. I am located in SW USA. |
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I think that we should keep it as it was. Multiple units for the same things would get confusing. Imagine purchasing 10mBTC on mtGox when you thought it was 10BTC! Things would get really confusing really fast.
We do have multiple units for USD, EURO, GBP, etc. |
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Can anyone report what is maximum safe operating temperatures for Avalon?
There are three temperature values reported Temp1, Temp2, Temp3. What do these correspond to?
With the current weather and temperatures I wanted to know at what cutoff point should I downclock the avalon.
Also, what is the max safe junction temperature of avalon chips?
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20 BTC  |
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Thanks for posting this - having zero familiarity with XE, could someone explain or speculate on how (if?) this will help BTC?
They use xe for trip reimbursement when traveling abroad on business trips. |
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As an interim solution, I would split your rigs in 2 clusters and make sure you run one cluster from a different fuse. I'm planning on taking over the spare guest room (different fuse). I've already taken over the office. Muhahahaha ! My wife complains that "It's a different microclimate" in there. Duh ! There's 4 graphics cards hashing ! I have 8 cards hashing atm with a cheapie window ac unit keeping it all relatively cool in my bedroom. One side of my room is 10+ degrees hotter than the other side. Its rly weird to move 2 feet and feel the temp change. Laying in bed its about 75f, sitting at my computer by the rigs its atleast 85f. lol
Get an electrician.
+1 Assuming you even figured out which one to purchase, watching you try to remove the old one would probably give me a heart attack. I've changed breakers b4, I was just looking for something better than the ace/homedepot $10 special. You don't have to know a hell of a lot to change a breaker. Usually the next greater amps rating breakers handle the the load of the lower amp breakers well. Just make sure you are not overloading the circuit amps rating by checking wire gage, and metering your power usage of your circuit. Also if u have good power strips, they themselves will limit power drawn at each socket due to a reset switch which pops, so that should take care of some simple overloading anyways. |
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goto home depot and get a new breaker with next greater amps rating.
THIS IS THE WORSE POSSIBLE ADVICE - DO NOT DO THIS.  Breakers are there to stop the wires in your wall going on fire. Replacing a breaker with a higher rated one leaves you at risk of burning your house to the ground. Speed limits are there to keep you safe. Better drive below the speed limit. If the wiring gauge supports the given amps it does no harm to reach the limit. |
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How much per unit are you charging for two units? Thanks
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I've been mining with some 7K325T-1 parts running the KC705 code clocked at 300MHz for a couple of weeks now. I notice that the hash rate starts to drop off after a day and a half and I have to restart the miners to get it to come back up. Has anyone else seen this?
you really need to slap some BIG heat sinks and BIG blowers on there. Had a similar issue with the Xilinx development board, even with a blower, lifted off the Mickey mouse heat-sink.. dropped on one twice as tall and now it sits at about 53 deg.c but it is CRITICAL you cool the SM PSU modules as well, I notices as they get hot... they drift UPWARDS!!! taking the core-voltage out of spec and causing further serious heating of the FPGA (not to mention its possible destruction.....) Which is why I had to throw in a 'system monitor" for both voltage and core temp...... then I had to split out the CLK for the communication & the logic separately and gate the SHA256 logic to the sys monitor..... (you cannot just gate the CLK, because it controls the FPGA internal function .. including the sys monitor...) Then I dropped some mini heat-sinks (for ram chips) on-top of the inductors for the SM PSU and the thing is stable even at 40 deg c ambient!!! Are you using the kc705? If yes, which heatsink did you use? How are you cooling the VRM / PSU? I have placed the board next to an AC vent, but that;s not a sustainable solution. |
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