I upgraded my AMD Phenom system to an Intel i5 system. Both the Phenom and i5 are quad-core (without hyperthreading) and 3.2GHz (although the i5 has turbo to 3.6GHz). I replaced the motherboard and CPU only. There are 2x 4GB sticks of DDR3 1333 RAM so 8GB total. I have 3 SATA drives. A basic performance test of creating 1:1 previews for 21 Olympus 16mp RAW files: AMD - 141 sec Intel - 80 sec That's a 76% performance increase. Windows does not feel much faster, but Lightroom definitely does. I had a limited budget and am very happy with the improvement in speed which is particularly on zooming in 100% and moving between photos.