I have a C1 that I have had for about two weeks.  the first week or so it was fine, but it has started to drop chips after a few hours of running.  the chips that X out are generally on the 2nd two boards and it can be anywhere from 1 or two per board to and the entire board that goes offline.

Even when the chips are not showing X, the hash rate bounces around between about 700 and 1100ghs.

I have one Rosewill capstone PSU (1000W gold) dedicated to running the C1 and cooling pump.

It came with the 10/16 firmware and was set to 250/0725.  I tried updating the software to 11/26 and set the freq/voltage to 250/0760, but it is still very inconsistent. 

I have two C1’s, and the other one seems to hash steadily at just over 1000ghs on the 10/16 firmware at the defaults of 250/0725.  The second one also has it's own dedicated Roswiill Capstone 1000w.

Any suggestions, or do I have a defective unit?

(i've sent the same content to info@bitmain)