The best tool for Hyperthreaded or multiple core systems in my software library is CPU-Control. It works on all brands of CPUs and is FREE. It runs in multiple modes, where a complete novice will gain performance with the auto-mode and proper enthusiasts, like me, can go far more granular and achieve even better results.
Give it a try, I am sure you will love it.
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Currently playing: RCT3(PC), DMC4 (PC). SW: Force Unleashed (PS3)
Favourite Game of All Time: Streets of Rage II (MegaDrive)

Intel C2D e6700 @ 3.33GHz |Gigabyte - GA-EP45-DQ6 | MSI NVIDIA GeForce GTX 280 1GB
2x Raptor 36GB in RAID0 (OS), 5x Seagate 250GB in RAID5 (1TB Storage)
CORSAIR XMS2 Pro 4GB (4x1GB) | LG L226WTQ 22" Widescreen TFT
Creative X-FI | Vista Home Premium x64, Suse x64.
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