I've had an Athlon II X4 630 overclocked to 3.5Ghz since January and am now facing stability problems. For nearly half a year it has worked flawlessly and proven to be Prime95 stable for around 5hrs, and hasn't caused a single crash. Originally it was at 1.45V, and I recently began having games crash so I bumped it up to 1.475V and the problem went away. I just installed Windows 7 Pro 64bit( replacing Vista Business 64) a few days ago, and it has booted into windows just fine at 3.5Ghz and installed the OS without a problem. Now if I try to run prime95 at 1.45V it crashes instantly, and at 1.5V it consistently crashes within 5 minutes. I'm looking for possible reasons that my overclock is no longer stable as I'm clueless. It might be worth mentioning that I defaulted by BIOS settings and now Win 7 won't load, it blue screened trying to start and is now in a start up repair because it refuses to start due to hard ware changes.
System Info
Windows 7 Pro 64bit
Athlon II X4 630
Gigabyte 780G AM2+ (I can get the exact model if needed, gonna need to look through receipts if windows doesn't load)
Gskill DDR2 1066 2x2Gb
Seagate 500Gb
Sapphire Radeon 4670
Antec Earthwatts 380W
Some random DVD drive
My bios settings were.
CPU Clock Ratio 14X
CPU Northbridge Freq 8X
CPU Frequency 250
Memory Clock X4 800mhz(1000mhz after overclock)
DDR2 Voltage Control 1.9V(default was 1.8V)
CPU NB Vid Control +.05(not sure what that even is)
CPU Voltage +.05
Thanks in advance to any suggestions I receive, right now I'm just trying to get windows to boot at default again.
System Info
Windows 7 Pro 64bit
Athlon II X4 630
Gigabyte 780G AM2+ (I can get the exact model if needed, gonna need to look through receipts if windows doesn't load)
Gskill DDR2 1066 2x2Gb
Seagate 500Gb
Sapphire Radeon 4670
Antec Earthwatts 380W
Some random DVD drive
My bios settings were.
CPU Clock Ratio 14X
CPU Northbridge Freq 8X
CPU Frequency 250
Memory Clock X4 800mhz(1000mhz after overclock)
DDR2 Voltage Control 1.9V(default was 1.8V)
CPU NB Vid Control +.05(not sure what that even is)
CPU Voltage +.05
Thanks in advance to any suggestions I receive, right now I'm just trying to get windows to boot at default again.