Saphirre 7870 freezing

[powersirj]

So i have 2 sapphire 7870 XT 2GB that i am trying to use on a bitcoin rig. If i install 1 card it will run for about an hour ( 480 MHz) and the computer will freeze. If install both cards i get about 2 minutes before the computer freezes, as soon as it hits over 825 Mhz it freezes. I have tried under clocking, over clocking. The temperature of each card has reached 67 degrees C. My mother board is a ASUS M5A99FX PRO 2.0. I only have 2 gigs of Crucial Ballistic memory installed. My PSU is a Corsair TX850. I dont know what to do to make it stop freezing. :twisted: Any help or suggestions would be most helpfull.

 

[tarmc]

try running them at stock speeds? reinstall vid drivers?


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[Ketchup]

So you have more memory on the combined video cards than for the rest of the system? What OS are you running?
32 or 64 bit?

When you said underclocking/ overclocking, are your referring to the CPU or the video card(s)s?

 

[Soulkeeper]

i'd think TX850 should be enough ...
+12V@70A
Even if both those cards are pull 200+ watts a peice and the rest of your system is pulling 300w you should still be ok.

Is your cpu overclocked a lot ?
maybe try swapping some plugs around to make sure things are well balanced
and no cables are loose

Is one card bad maybe ?