get the 640gb black by western digital it is very fast because of its dual 320gb platters, in fact it is as fast as the older non veloci raptor hdds
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[Desktop] |i7 3770K|8GB Patriot Viper DDR3|Seagate Momentus XT 500GB|Seagate Barracuda XT 3TB|EVGA GTX 660Ti|CM690II Advanced Nvidia| |