Have you installed the AMD Dual-Core Optimizer software for AMD X2 CPUs ?
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The AMD Dual-Core Optimizer can help improve some PC gaming video performance by compensating for those applications that bypass the Windows API for timing by directly using the RDTSC (Read Time Stamp Counter) instruction.
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ASUS A8N SLi Deluxe
Corsair 2GB DDR XMS3200XL Pro TwinX (4x512MB)
AMD Athlon 64 X2 939 4600+ @ 2.6 Ghz
ATi Radeon HD 3850 @ 680/844
80GB SATA HDD/200GB PATA HDD
1x DVDRW DL
485W PSU, Alpha watercooling
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