I don't know how to judge this in respect to your system, but I have (a single) slightly slower processor, half the RAM but a better card (ATI X1600), and I can run 1280x1024 at full aliasing with all options on high at over 25 FPS. If I do HDR (no antialiasing), only the most intensive graphic scenes take me under 20 FPS at 1600x1200, which is my monitor's max resolution.
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