I never completely trust Tom's Hardware.  A lot of the performance specifications are affected by factors other than just the CPU.  Motherboard, Bios, controllers, and other hardware can really change test results.  When I built the monster I have now, last year, I did about 3 months of research to find components which will work best with the CPU I selected.  Right now I am toying with installing Vista 64Bit and tri-booting with the 32Bit Vista and XP 32Bit.  It would be nice to be able to access all of my 4GB of RAM.  Has anyone here tried it?