The 3870K is a beast, rivaling Phenom II core-for-core. There should be no need to force a non-stock configuration in the BIOS.
It has been said that the CPU portion can, at times, hold back the IGP so the only thing I could recommend would be a small overclock w/ a minor voltage bump.
What do you mean by "drain the maximum processor performance"?
Desktop: AMD Phenom II X4 955 @ 3.5GHz, Sapphire Vapor-X HD5870, ASUS M4A78T-E, 8GB Kingston/Mushkin DDR3-1333, 256GB OCZ Vertex 4, 2xSeagate Momentus XT 500GB Hybrid Drive (RAID0), ASUS Xonar Xense, Corsair HX750W, Antec Nine Hundred, Windows 7 Professional x64.
HP Touchsmart TM2: Intel Core i5 430UM, Hitachi 250GB 7200RPM HDD, ATI Radeon HD5450, 8GB Samsung DDR3-1333 (CL9), Windows 7 Professional x64.
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