A question about CPU and Cross Fire

Well, sometimes my Cross Fire goes very slow at 8 vs 8 matches, with like 28 FPS or ****s like that... I formatted my PC and the problem is still there, the temperature of the CPU is 45-50º at Idle and something like 65º playing Cross Fire. [I play with all progrems shutted down, including antivirus, so thats not the problem (I use Windows XP) I play with Texture "Low" at 1440x900 (wide) screen in my 1950x1080 screen.

My question is, I have an Nvidia 8500 GT, 3 GB RAM and an Intel Pentium D 2.8 GHz... the Cross Fire recomended system requierements is Pentium 4 - 2 GHz.

Why is my Cross Fire running so slow? Intel Pentium 4 is better than Intel Pentium D (it's dual core) for playing it?

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