Okay I tried the 600MH/s bitstream on a second Kintex-7 325T device and the temps are 70C. For the record in the same environment the other Kintex-7 325 chip hovers at 30 - 35C in the same setting. For curosity's sake, you could measure the heatsink's temperature. If both heatsinks are the same temp, it's likely your "special" FPGA either has a broken temp sensor (as gingernuts mentioned), or perhaps calibration is off (I think those sensors can be calibrated?). If the temps are drastically different ... well ... I guess you won the FPGA lottery  Don't own a thermometer. Any other method that comes to mind? Most likely it's a calibration issue. Will plug it in a Kill-a-Watt first to get any anecdotal evidence (power consumption differences) Power consumption is same for both FPGA boards at 45Watts, 600MH/s. The one that shows lower temp probably has a poorly calibrated temp sensor. Reported temps are around 1/2 of the actual temp. So this info solves this small mystery. Even allowing for the mains PSU efficiency, 45W seems a lot for a mere 600MH/s - 4x Spartan 6's will give you 800MH/s for the same power - I guess that demo board is burning loads in all the other stuff that's on the board (RAM/Ethernet etc)... Yes it is, and my ultimate plan is to make the board into a self contained miner using a small microblaze with Linux. |
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goto home depot and get a new breaker with next greater amps rating.
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India is always late to the race usually. They might pick up BTC when it's already mainstream elsewhere especially in China.
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How can I trust you to send it after I pay you?
Escrow FTW |
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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?
Nope, I am using 7K325T-2 @ 600MHz. Hash rates have been stable @ 600MH/s for > 1 week. What was needed is active cooling (good airflow using fans) of the VRMs and FPGA. The FPGA easily reaches > 70C, and in the absence of active cooling it sometimes stops working. |
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I think so, for appearance and encouragement's sake. It helps encourage new users and miners, so that their wallet looks a bit more full.
So instead of earning 0.01BTC/day on my shiny new GPU / USB ASIC I will earn 10mBTC/dat.
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Fat Bankers shaking in their boots yet?
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Can you share the source code for the comm module? I will try to add it to the KC705 / Kintex-7 comm code. It's all there in serial.v and fpgaminer_top.v. Read the spec too for an overview. I cannot share all of the RS232 code, since I use an external set of files which you can download from fpga4fun, as linked. Great thanks! |
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Will it make 26BTC over the useful life of this device?
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Can you share the source code for the comm module? I will try to add it to the KC705 / Kintex-7 comm code. |
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I got 7.40599066 BTC stolen, due to unencrypted wallet +btc client outside the firewall.
Status: 10782 confirmations
Date: 4/1/2013 14:01
To: 149kuVmGKWUwsN8bvu4WTthc6mVwEB3A2E
Debit: -7.40599066 BTC
Net amount: -7.40599066 BTC
Transaction ID: ad30186ab82a59770ba6dbe891846f4dc2c31c61b0f8e72229180ecf146ef18f
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Okay I tried the 600MH/s bitstream on a second Kintex-7 325T device and the temps are 70C. For the record in the same environment the other Kintex-7 325 chip hovers at 30 - 35C in the same setting. For curosity's sake, you could measure the heatsink's temperature. If both heatsinks are the same temp, it's likely your "special" FPGA either has a broken temp sensor (as gingernuts mentioned), or perhaps calibration is off (I think those sensors can be calibrated?). If the temps are drastically different ... well ... I guess you won the FPGA lottery Don't own a thermometer. Any other method that comes to mind? Most likely it's a calibration issue. Will plug it in a Kill-a-Watt first to get any anecdotal evidence (power consumption differences) Power consumption is same for both FPGA boards at 45Watts, 600MH/s. The one that shows lower temp probably has a poorly calibrated temp sensor. Reported temps are around 1/2 of the actual temp. So this info solves this small mystery. |
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Okay I tried the 600MH/s bitstream on a second Kintex-7 325T device and the temps are 70C. For the record in the same environment the other Kintex-7 325 chip hovers at 30 - 35C in the same setting. For curosity's sake, you could measure the heatsink's temperature. If both heatsinks are the same temp, it's likely your "special" FPGA either has a broken temp sensor (as gingernuts mentioned), or perhaps calibration is off (I think those sensors can be calibrated?). If the temps are drastically different ... well ... I guess you won the FPGA lottery Don't own a thermometer. Any other method that comes to mind? Most likely it's a calibration issue. Will plug it in a Kill-a-Watt first to get any anecdotal evidence (power consumption differences) |
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Can you please point me to the hashing code that you used? I want to program my 7K325 on KC705 board with that code and check its performance. Thanks
It was the OrphanGland stratix IV code ported over to the K7. We were planning on making an FPGA device but the power utilization vs hash vs cost figures weren't as close to the avalon figures as we had hoped. Is that code the same on fpgaminer's github project or is there another link? Any link would be great. Thanks! |
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