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The green drive is a little slower (slower rotation) but again I would time how long saves/loads are actually taking to help determine if the perform is strictly the disk. The processor is quite decent and ram is fine. To put things into perspective your drive is a 5400 rpm; the normal speed hard disk is 7200rpm and you can find 10,000 rpm drives. For large objects you should see near linear performance improvement with rotational speed as long as you maintain the same platter density. (Some of the smaller drives like raptor 10k are actually slower for large objects because the platters are less dense).