Quote from: AniceInovation on November 14, 2013, 04:02:29 AM

Hello all

I have a stack of 8 boards. They are terminated and working as expected. Almoust.
I'm only getting 350Gh/s from them and expected 400.

However, i noticed that the board where the USB is connected, the red led blinks much less, and is way colder than the others. Changing the USB to other board makes that other board slow down.

Does anyone have a tip?

I did not watch the red LED frequency with mine stacks, but what prevented them from reaching 400GHps turned out to be insufficient power. With 850W PSUs I was not able to reach more than 360 (and also had USB errors, btw.), now with a 1200W PSU everything works smooth and each board is at 50GHps on average (1080mV, 275MHz). At wall I measure around 750W draw, but there might be spikes that a PSU operated at its edge can't handle.

What you can try to double check is to operate only 4 boards at a time and check they reach 200GHps (terminate CAN bus correctly + unplug ribbon cable from inactive ones). If so, you need a stronger PSU.

Also, I instructed you to use an older version from cgminer for best results, which is not true anymore. Current master HEAD works fine with the latest BBF firmware.