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i5 2500k: Should I disable [Auto] CPU voltage when overclocking?

post #1 of 8
Thread Starter 
I'm trying to get a decent overclock on my Core i5 2500k and I have a quick question...

Should I leave my CPU voltage at [Auto] or should I change it to something else?

My motherboard is an ASUS Sabertooth P67.

Two nights ago I change my Turbo Ratio to 40 (for 4.0 GHz) and ran Prime95 overnight and it didn't crash so I thought I would try 45 (for 4.5 GHz) but I literally didn't change anything else in the BIOS (and I'm not sure if I should...)
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post #2 of 8
dont leave it on auto because it will normally call for more voltage than required, which can limit your higher clocks.
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post #3 of 8
Thread Starter 
OK - What voltage should I start with for 4.0 GHz or 4.5 GHz?

I should be able to overclock this to 4.0 - 4.5 GHz by ONLY adjusting the Turbo Ratio and CPU voltage, right?
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post #4 of 8
Quote:
Originally Posted by sofakng;14296676 
OK - What voltage should I start with for 4.0 GHz or 4.5 GHz?

I should be able to overclock this to 4.0 - 4.5 GHz by ONLY adjusting the Turbo Ratio and CPU voltage, right?

yeah, the turbo and vcore is all you can get away with touching if you want a quick OC.

for 4.0 you could prob leave it on stock voltages, and @ 4.5 every chip is different.
mine is power hungry and needs 1.351 with LLC enabled, but others may only need 1.27.
start with 1.32 and see if you can load windows, if you can then test for stability.

better yet, start @ 4.2 and see what vcore you need.
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post #5 of 8
Thread Starter 
Here's what I'm getting with a 40x ratio and [Auto] voltage:

CPU-Z Idle Voltage: 1.304 - 1.320
CPU-Z Load Voltage: 1.264 - 1.280

Temps (min): 31, 34, 34, 33 (four cores)
Temps (max): 57, 61, 61, 58 (four cores, Prime95 for 30 minutes but temps maxxed at 5-10 minutes)

How does that look? Should I enable LLC to prevent vdroop? What do you think would be a good starting voltage for me for 45x ?
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post #6 of 8
Quote:
Originally Posted by sofakng;14312541 
Should I enable LLC to prevent vdroop? What do you think would be a good starting voltage for me for 45x ?

Try Ultra High (75%) LLC to compensate the droop, and start with 1.22v and work your up. When you get some time check out the Sandy Stable Club for overclocking, voltage and temperature reference.

Hope that helps.
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post #7 of 8
when i overclocked my cpu i started at 1.20v and i managed to get 4.3 out of 1.20v. but ive found that there's a sweet spot with these cpu's and once you push past that point it takes larger vcore jumps to get where you need.

for example, my cpu will do 4.7ghz at 1.304v idle and jumps to 1.344c under load. thats about the best i could get to keep it stable, tighten up ram timings helps a lot too ive found. very easy cpu's to overclock not like AMD chips
post #8 of 8
I hit 5 ghz on 1.420v. Tweaked a few settings, works like a champ now
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