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Dual r9 290x  freeze

Question asked by dual290x on Aug 14, 2015

I am running a Phenom 2 x4 955 BE, 8gb of ram, and dual R9 290X all on a ASRock 970 Pro 3 R2.0. I am able to run all hardware fine with a 1050W PSU from EVGA. I cannot however, run both GPUs at once in FULL SCREEN MODE. If I try to run Battlefield 3 or Valley Benchmark  in full screen then my pc freezes and I have to force shutdown my pc. If I run Valley Benchmark on non-fullscreen mode then it runs beautifully. I do not know how to run Battlefield 3 on non-fullscreen mode. If I run both cards separately then they both run fine. I am running the cards on Crossfire of coarse. I need help determining the problem. I am thinking it may be the motherboard but I do have the ability to test that theory.