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I have a AMD 1.5Ghz athlon pc,with a XFX GForce 5200 256 mb card,my motherboard is Asus 4x.The card has been underperforming since i bought it.Recently i discovered it is down to the fact that it is running at 0x or 1x speed,while its capable of running till 8x.Now how and where do i change these settings so as to enbale it to work at it's optimal settings.