Looking to get a HD 7950 GPU to play Crysis 3 on high settings. I want to know if this will work or do I need to upgrade anything else, here is my current setup:
Video Card: Sapphire RADEON 6850
CPU: AMD Phenom II X4 3.0GHz
Memory: Patriot Sector 5 8GB
Motherboard: ASRock 970 EXTREME3
Power Supply: Cooler Master 600W PSU
Hard Drive: Seagate 300GB HDD
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The PSU you have is not high quality and likely doesn't make 600w. Coolermaster PSUs are generally junk. That said, if it ran your 6850 the 7950 should be alright. I would replace it with a better unit though. Corsair, Antec, XFX, Seasonic make good units.
Your CPU is a bit old. It shouldn't bottleneck the GPU, but it will be a weaker spot in highly intensive games. That said, it should be fine still.