At core speeds of around 490Mhz you're probably reached the limit for stock volts. The bios flash can help slightly, but really you'll probably need to do a physical vmod to get it stable at higher speeds.
My 7800GTX wasn't stable over 490Mhz on the core with air or water.
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CPU Intel Core 2 Duo e6400 |
Motherboard Gigabyte GA-965P-DS3 |
Memory 2GB G.Skill pc8000 |
Graphics Card Geforce 7100GS |
Hard Drive Samsung HDS-321KJ |
Sound Card X-Fi / Logitech z680 |
Power Supply Seasonic S12 430W |
Case Coolermaster Stacker |
CPU cooling Storm G4 |
OS Vista |
Monitor Dell 2407WFP |
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