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I just installed an Radeon HD 6950, upgrading a Radeon 4850, but I'm seeing no difference in frame rates on my games. I've updated all my drivers, flashed the motherboard bios, and done clean installs to no avail.

Is it possible that my power supply is not providing enough wattage (it's 500W I believe) and therefore the GPU is running at a slower clockspeed? Or would the computer just crash if it wasn't getting enough power? I'm having no stability or overheating issues.

Thanks in advance.

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What makes you think that you're running at a lower GPU speed? –  kobaltz Dec 27 '11 at 23:05
    
I'm seeing no difference in peformance in my games (COD4, Mass Effect, Metro 2033). –  Tim Dec 27 '11 at 23:08
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You may not see a difference depending on your settings. A lot of games with Vertical Sync enabled will limit your frame rate to 60fps. Disabling this on any game that I play bumps up the speeds to over 200fps (using 6970CF) –  kobaltz Dec 27 '11 at 23:20
    
What frame rates are you seeing in those games? –  David Schwartz Dec 28 '11 at 0:54
    
Also keep in mind that some games hit a CPU bottleneck. After all, the CPU and RAM have to feed the workload to the GPU (via PCI) so maybe that is the problem. Note that More cores may not keep you out of the woods. Generally weighting to CPU performance for gaming (IMHO) is Die Generation > Clock > Memory speed > Cores. –  Daniel Park Apr 8 at 6:08
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