Linky
Read the article, but also the comments; they're more important. Disabling one core per module frees up shared resources and improves IPC, and also lowers power consumption by 30-40%. There are quite a few comments here that have information on this... maybe I will post some of them in this post later if I have time.
-------------------------
ASRock M3A785GMH/128M
Phenom II X4 925c2 @ 2.80GHz (95W)
OCZ Platinum PC3-1333 2x2GB 7-7-7-21
WD5000AADS
Raidmax RX-500AF
Check it out.