Presumably PSU efficiency will be higher for higher incoming voltages.
Surprisingly, not by that much. You might see 1-3% for 230 over 115V which I think is a testament of how well developed the tech has become.  Yup ~2% loss of efficiency by going down to 115V. A few other obvious locations of power loss are the DC power cables i.e. the PCIE 6/8 pin power cables. I have noticed that if I use a dedicated cable for each of the 4 PCI 6pin socket on the miner, the power consumption is reduced by ~8Watt for the Antminer S5. |
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When I look at your pictures, it appears that your power supply is using one cable, with two PCIE connectore, for each hashing board. That would suggest that each power cable is handling roughly 270 watts. Are the PCIE cables or connectors hot when the S5 is running at full speed. That seems like it's about the limit of what you would want on a PCIe power cable, no? Maybe I don't really understand what a PCIE cable can deliver.
Just a thought.
260W is fine. That cable has 2x PCI-E 8 pin connectors on so must be able to handle at least 2x 150W. Exactly, the power rating of the 8pin connector is 150W per connector. The cable is slightly warm to the the touch. |
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Download the entire tar.gz archive. The file is extracted inside the S5's embedded computer. You need to upload the whole tar.gz file. If the file is unarchived (e.g. in MacOS X; re-download it using right-click and "Save as") Official Link to firmware file page.
https://bitmaintech.com/support.htm?pid=00720150101032800325X8cMcY2y068FLogin to the S5 web interface and goto Upgrade tab. Choose the correct file i.e. for e.g. SD-S5-20150107.tar.gz and press `Flash Image' button  MD5Sum MD5: 0C30D32D68E64F528DA06AF19B23D859 |
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Hashrate stability chart at the pool @ 393MHz clockspeed. ~1250GH/s:610Watts
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Annoyed by the constant surging and whine of the fan on S5 ?,
Put small heatsinks on the two temperature sensor chips LM57A(8 pin chip at the center of the hashing boards)  Heatsink on the Temp sensor chip will lower fan speed to default low ~2.2Krpm.
Do it for both the hashing boards and enjoy peace and quiet  
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An even cheaper mod would is to trick the temp sensors into lowering fan speed to the lowest range. |
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Ford GT is better.
A well qualified scientific statement |
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http://www.digitaltrends.com/cars/acura-nsx-vs-ford-gt-high-tech-supercar-showdown/ The NSX features a Sport Hybrid Super Handling All-Wheel Drive (SH-AWD) setup, which is about as complicated as its name suggests. A mid-mounted, twin-turbocharged V6 is teamed with a nine-speed dual-clutch transmission and three electric motors. One motor is mounted between the engine and transmission to help drive the rear wheels, while the other two drive the front wheels, providing torque vectoring for sharper handling. Acura emphasizes the instant response of the electric motors, but isn’t talking specific power output yet. The best estimate we could find was around 550 horsepower, which isn’t too shabby.
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Does Tesla build cars for BTC? |
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