Thanks for the replies...
After some investigation last night I am pretty sure that it is the powersupply...
I tried to reconfigure the power cables (its modular) to spread the drain over multiple connectors but that did not seem to help
1/4 of the time when I hit the power button the psu fan will spin a quarter turn, stop and the system wont boot.... pretty sure this is the issue
I have another older psu out of an old prebuild sony desktop that I tried to run one card off, but I could not get the psu to start without connecting to the mobo.. (tried shorting the green and black lines on the mobo connector). anyone else trying this?
Right now I have 3 of the cards mining, 2x5870 @ 435 MHash @ 75*C with fan on auto (usually around 45%) and the 6870 @ 315 Mhash @ 68*C fan also on auto...
Are those temps/speeds decent?
For those of you running linux, how do you OC the cards past 900 MHz? I would much prefer to run in linux but cant for the life of me OC my cards. the diff between 900 MHz and 980 MHz is about 75MHash for me...