A client which sympathizes with our situation on this thread made some high def photos of his 1.2Th, we thank for his help.
Guys,
Just wondering does the whole unit shutdown on overheat, before things burn out, just thinking of single fan on top if it fails what happens? I hate for it to become a really expensive brick?
The chip itself has an overheat threshold which is around 130's C. If the chip shuts down, the chain breaks cause the whole the unit to basically shut down from a hashing perspective. If you're using putty, you'll see an error message similar to CMD_READ_REG ERROR. If you see this, unplug it, wait 30 minutes restart it via putty and do the following:
root
amt
killall cgminer
cgminer -DT
And check to see if the cores in each chip are ok.
Also there are two 4-5 fans in this case. There are two 140's under the cage blow air up through the fins. The 200mm exhaust on top and the 120mm x 1 or 2 in the front of the case blowing air in.