Bitcoin Forum

Hi,

I have four Bitburner Fury boards that work just fine. I do run them with cgminer options: –avalon-options 115200:32:10:50:256 –bitburner-fury-voltage 950

But no matter what I change with the voltage options all bitburner boards run with 1150 mV and hash about 46-49 Ghs. I really like to bring hashing down to half that number - underclock it. I guess that can be done using the options but I cannot figure out how the equations works. Can anyone point me in the right direction?

And if anyone wonders why I would underclock. The fans get quite loud in our small condo and my wife isn't that happy about it. So either underclock or turn off at night  :(

OR... buy some quieter fans..!!

for 120mm...  try http://www.amazon.com/Setting-Anti-Stall-Bearing-NF-S12A-FLX/dp/B00BEZKX8Y/ref=sr_1_4?ie=UTF8&qid=1387488603&sr=8-4&keywords=noctua+120

for 90mm... try http://www.amazon.com/Noctua-NF-B9-PWM-Cooling-Fan/dp/B006GD3K5C/ref=sr_1_1?ie=UTF8&qid=1387488643&sr=8-1&keywords=noctua+90mm

you will barely even be able to tell these fans are on, theyre so quiet !

I have 2 boards with a broken USB port and one that never hashes above ~14Gh/s. Last week I saw one of the chips wasn't completely soldered on all the way! IS there a way to fix these issues?

RMA or find a friend with smd skills or a local smd shop or hackerspace

RMA from US to Belgium with the lack of resonse from cryptx makes it almost not worth it.

CANBUS connecting them us always a luck of the draw. How do I upgrade the firmware without an usb port?

And one of my boards has a chip slightly raised off the board. Might explain why it works but only at 12-14Gh/s, how would I fix that without destroying the board.

Leave bad rating to cryptx maybe and warn everyone that you can about his crappy business skills?

I replaced the stock 92mm fan with a quieter Noctua but now bitburners tend to overheat after a few minutes. The stock fan runs at around 3000rpm whereas the Noctua has a max of 1900. So I guess I need a more powerful fan when running the bitburners stacked.

try "-bitburner-voltage xxx"

My Bitburner Furys don't seem to undervolt.  Even though cgminer lets you set the voltage down to 800mV 700mV, setting below the default of 900mV doesn't seem to have any affect, at least judging by the reported voltage in cgminer.  I guess that's a firmware limitation, so your mileage may vary.

Also, as it stands, cgminer doesn't allow clocking below the stock Bitburner Fury speed of 256, unless that's changed very recently.

You'd have to have some pretty good chips in your board to want to undervolt without underclocking, anyway, or you're just going to get HW errors.

roy