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Unable to clock past stock after reducing ratio

post #1 of 8
Thread Starter 
Title pretty much says it all. Just got an i5 2500K for a new rig. Dropped the CPU ratio down to 31 from 33 and started raising the FSB up until the CPU clock was around 3.3, which was the stock frequency.

I even raised the core voltage up to 1.1.

Try to reset and computer doesn't POST.

Do I just need to go nuts on the voltage to get things to work out?

Also: what difference is there in CPU I/O voltage and Core voltage? I've seen a lot of builds where people will just up this (I think?) to 1.3.
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post #2 of 8
With sandy bridge just increase ratio until you get close to your desired speed, then use Blck to tweak.
post #3 of 8
Thread Starter 
I thought that just increasing the ratio didn't have the same effect on performance as dropping it a couple of notches and bumping up the FSB?

Is it different with the new sandy bridge sets?
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CPUMotherboardGraphicsRAM
i5 2500K MSI P67A-GD65 GTX 580 2x 4Gb DDR3 (Corsair) 
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CPUMotherboardGraphicsRAM
i5 2500K MSI P67A-GD65 GTX 580 2x 4Gb DDR3 (Corsair) 
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1TB WD Caviar Black Windows 7 Home 64-bit Corsair 750W HAF X 
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post #4 of 8
post #5 of 8
Quote:
Originally Posted by knotwrite View Post
I thought that just increasing the ratio didn't have the same effect on performance as dropping it a couple of notches and bumping up the FSB?

Is it different with the new sandy bridge sets?
Very different. The BCLK on sandy bridge controls everything from pci lanes to usb speed, changing it ~5% or so from stock could stop all of those things from working.
Here is a guide to help you out.
post #6 of 8
Thread Starter 
Wow. Thanks for the replies!

I had no idea overclocking was so simple nowadays. Thank god for sandy bridge technology.
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i5 2500K MSI P67A-GD65 GTX 580 2x 4Gb DDR3 (Corsair) 
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i5 2500K MSI P67A-GD65 GTX 580 2x 4Gb DDR3 (Corsair) 
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1TB WD Caviar Black Windows 7 Home 64-bit Corsair 750W HAF X 
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post #7 of 8
No problem, we are here to help.
post #8 of 8
Thread Starter 
Also: DiHydrogenMonOxide, you have the best signature quote I've ever seen ever.
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CPUMotherboardGraphicsRAM
i5 2500K MSI P67A-GD65 GTX 580 2x 4Gb DDR3 (Corsair) 
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1TB WD Caviar Black Windows 7 Home 64-bit Corsair 750W HAF X 
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CPUMotherboardGraphicsRAM
i5 2500K MSI P67A-GD65 GTX 580 2x 4Gb DDR3 (Corsair) 
Hard DriveOSPowerCase
1TB WD Caviar Black Windows 7 Home 64-bit Corsair 750W HAF X 
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