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When I enable "Intel TurboMode Tech" in CMOS Setup of P55H-A V1.0, I see the CPU performance only getting a little higher. How to improve it?

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System reports 8GB(3.99GB usable) at 64bit OS with 8GB(2GB*4pcs)memory installed. And "Memory Remap Feature" is "enabled" under Advance Chipset of BIOS.