2x 74gb WD Raptor 10k raid 0 vs 4x 80gb 7.2k 2.5 raid 0 i am currently running 2x 74gb Western Digital Raptor hard drives for my main OS drive its pretty fast but LOUD and they need a fan sitting right next to them to keep them cool and 140gb really isn't enough space once games get installed i am upgrading 4 laptop hard drives to 500gb for someone and this leaves me with 4x 80gb 7200rpm laptop drives. my questions are: will 4x 2.5 7200rpm 80gb laptop drives be much faster than the 2x 15k rpm raptors? can i stack 4 laptop hard drives without them overheating? should i run raid 0 on them? 4x drives are twice as lightly to fail than 2x or sacrifice a drive and some speed and do raid 5 on my amd 785g chipset?