I just recently built a system using an AMD X2 6000+, 2GB GSKILL DDR800, Gigabyte GA-MA770-DS3, NVIDIA EVGA 8800GTS 512(G92), and I have 2 hard drives one a Seagate 320GB 7200 and the other is a 250 Seagate 7200.. Ok so first of all I installed win xp 64bit on the 320gig hard drive.. I installed all the drivers NVIDIA drivers, evga tweaking utility, chipset drivers ect.. I put WoW on this computer and I was using this one for awhile until I got my 250gb back from newegg.. has more cache so I want to use that. I played WoW on the 320GB hard drive perfectly for a week straight. I just yesterday put windows vista 32bit on my 250gb and installed every driver for that.. graphics ect.. When I'm playing WoW my computer shuts off after like 10 minutes of game play.. I unplugged the 320gb and have only the 250 setup to run now. The temps all check out my cpu is at 39C, the system temp is 34C, and my Vga card never gets over 52 with the fan speed turned up.. My power supply is a 585 watt one and I'm doubting thats the problem since it worked on my other hard drive.. I really dont know why one hard drive would play it well but the other wouldn't? This system is like 2 weeks old.. helpPPPP