I’ve found TF2 to be CPU-bound by far, since I had the very same 4870×2 (but one) with a c2d E6600 3.4ghz before and the pretty much same result - 200~ fps stable in “non-fights” and always around 150fps otherwise (m0res ‘normal’ fps config, 1680×1050, 2xmsaa 4xaa - everything else set as low as possible). I have a pretty decent rig (I7 920 3.9ghz and 2x 4870×2 with 12gb ram) running win7.
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