CPU Overclock Not Stable Anymore

Veradun · 29 Mar 2013 at 22:41

Was redirected here by 5UB

My CPU is the i5 2500k and recently I moved my components to a new case and also upgraded the graphics card. Before I was achieving a stable 4.3GHz with no problems, now I'm only getting around 3.9GHz. I'm not sure why this is as the new case has better airflow and more cooling. I didn't removed the CPU cooler either when moving the mobo over, so I ruled out a thermal paste problem, but I don't know. Just think it's weird that I lost 0.4GHz just from moving case, it might have even happened before then, but I checked around 3 weeks prior to moving and it was at 4.3.

Would just like to know what could have caused it :confused:

deuse · 30 Mar 2013 at 08:10

I don't know much about OC but have you tried putting your old graphics card back in?

8 Pack · 30 Mar 2013 at 17:24

The overclock could have been removed if you removed or knocked the bios battery when moving cases as this would cause Bios settings to be lost.

Also a change of card can make a difference to overall stability by putting greater demand on the PCI EX lanes which are controlled by the CPU.

Veradun · 30 Mar 2013 at 18:51

It was upgraded from a Sapphire 2GB 6950 to a Sapphire 3GB 7970 if that matters, but it may have happened even before the move. Shall I post my CPU Bios settings here? Doesn't look like they changed from before besides the multiplier. I think the Vcore is on auto though so it might be that. I was never sure what the max Vcore was for daily use, think I saw somewhere it was around 1.5v max?

8 Pack · 30 Mar 2013 at 19:17

Post up your settings yes!!!

Veradun · 30 Mar 2013 at 20:32

Okay, pics were easier, and I was right, Vcore is auto:

8 Pack · 2 Apr 2013 at 10:31

Set the Vcore to previous levels and test!!!! Should be fine now mate. Maybe the Bios battery needs changing if the system is loosing settings.

Veradun · 2 Apr 2013 at 15:24

8 Pack said:
Set the Vcore to previous levels and test!!!! Should be fine now mate. Maybe the Bios battery needs changing if the system is loosing settings.

Should I use manual volts instead of auto? As these settings now fail on 4.3Ghz, so I wonder if auto isn't cutting it anymore. Not used manual Vcore before so I assume I aim for a multiplier, and keep raising the vcore until stable.