fried_egg :
I realized what Kirby said and actually you're wrong. No offence.
When games don't support multiple cores, they are still using 1 core, hence like Kirby said : You mean 3 cores. Because one of the cores is still being used.
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Current PC specs :
AsRock 945GCM-S
Pentium Dual Core E5200 @ 2912Mhz (233x12.5)
Palit Radeon 4850 Sonic 512MB gDDR3
2x2048MB Kingston DDR2 800Mhz RAM