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XFX 7770 and ASUS 7770 cross fire HELP!

November 13, 2012 1:47:25 AM

hello everyone, i found an asus 7770 to go along with my XFX HD 7770 black edition in crossfire... things aren't going well with it.
in games like MW2, after a few kills the screen freezes and pc becomes unresponsive... only way to get out of this is to reset the pc uisng the reset button.
BUT
when im running just the XFX 7770 NOT in cross fire everything is fine...no freezing or anything.. what are the steps to trouble shoot this issue? any ideas?
here are my current pc specs:

Asus Sabertooth 990fx
AMD FX-8150 with Hyper 212 evo cpu cooler running at 4.1 ghz ( can oc higher but dont need it?)
2x 1TB harddrives
1x OCZ vertex ex3 120gb SSD
8GB DDR 3 RAM
XFX Radeon HD 7770 ( DD black edition) 1GB
ASUS HD 7770 1GB
OCZ 600W PSU 80plus certified

any help would be appreciated, thanks in advance.

!