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New i5 2500K owner, need help OC'ing - Page 2

post #11 of 19
Recommending a vCore is hard. YMMV (your mileage may vary), as it is REALLY dependent on how good your CPU is. For example, my 2500K needs 1.36v just to be stable at 4.5GHz (), while I've seen many users here on OCN with 4.5GHz stable at less than 1.30v! I'd recommend starting at 1.30v, then if you find it's Prime95 stable, decrease the voltage. If not, increase it. As for LLC, I think I have mine set to 'Auto', but I can't be sure... and I'm not able to restart my computer right now.

Hope this helps.
 
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dm1z
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post #12 of 19
Thread Starter 
Thanks. I've been doing some research and it seems that VID is NOT the same as VCORE. CoreTemp shows that my VID is at 1.378v and CPU-z/HWmonitor shows my VCORE is at 1.29v (under full load). It seems to me that I am running at 4.5GHz with a core voltage of ~1.29GHz. I have been running prime95 for 30 minutes now so far no problems, temperatures around 50 celsius. Will report back after more tests!
post #13 of 19
Quote:
Originally Posted by metroidslayer View Post
What Vcore would you recommend for a stable 4.5GHz overclock? Do i need to mess around with LLC settings? So far its on '5' under BIOS settings.
Mate just leave the voltage to automatic, the system will bump it if needed and it will reduce voltage on idle. Mine idles at 0.98mV and voltage bumps automatically at 1.35mV when the CPU power is needed (at 4500MHz).
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post #14 of 19
Thread Starter 
Okay, so i've OC'ed my chip to 4.5GHz by changing only the multiplier (x45). Vcore was left on auto and tried running Prime95. CPU-Z showing me Vcore was around 1.28v. Within 20 minutes, i had a BSOD. I then decided to change LLC to '5' and run Prime95 again. So far its 25 minutes in with no BSOD. One question though:

I noticed that in the first 20 minutes my multiplier is normal (x45) and vcore at 1.30v. But right after 20 mins, Prime95 starts a different iteration and my multiplier will drop down to x40, vcore also drops to 1.26v respectively.

Is this drop occurring because of a different test Prime95 is running or is this something to do with my chip/BIOS settings which require more tweaking?
post #15 of 19
Quote:
Originally Posted by metroidslayer View Post
Okay, so i've OC'ed my chip to 4.5GHz by changing only the multiplier (x45). Vcore was left on auto and tried running Prime95. CPU-Z showing me Vcore was around 1.28v. Within 20 minutes, i had a BSOD. I then decided to change LLC to '5' and run Prime95 again. So far its 25 minutes in with no BSOD. One question though:

I noticed that in the first 20 minutes my multiplier is normal (x45) and vcore at 1.30v. But right after 20 mins, Prime95 starts a different iteration and my multiplier will drop down to x40, vcore also drops to 1.26v respectively.

Is this drop occurring because of a different test Prime95 is running or is this something to do with my chip/BIOS settings which require more tweaking?
I have no idea... maybe the Prime95 experts out there can answer this?
 
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post #16 of 19
From what I heard in a couple different places is that up to 4-4.2ghz? is where you can just adjust the vcore and the multiplier. After that you need to change some additional settings (couldn't tell you what ones, I got mine from one of the many great guides). But I know you never want to leave the voltage on auto, it's not bad for the CPU but it does a poor job judging the voltages needed.

Like said before, can't really give you a voltage recommendation. They recommend that you start at a low voltage and run Prime95 for about 30mins-1hour to see if its somewhat stable and keep bumping up your volts until it is more stable then run an 8+hour test to make sure of stability. I personally have 4.5ghz at 1.27 but I guess I just got lucky.
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post #17 of 19
Thread Starter 
I think i found the problem. Did a bit of searching and apparently my multipliers are dropping under load because of the power limit duration (was set to auto in BIOS). Went and fixed that according to these parameters

->Short Duration power Limit [w]: 200
->Long Duration Power Limit [w]: 180
->Long Duration Power Limit [sec.]: 1

Ran Intel Burn Test again (10 runs) and my multiplier held up (so did vcore). Now going to run Prime95 for a couple of hours
post #18 of 19
Glad to hear you're making progress dude. Try for a 12 hour custom blend run and join the Sandy Stable club!
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post #19 of 19
Quote:
Originally Posted by _s3v3n_ View Post
1.056v is the idle vcore of your chip. Try running Prime95 or IBT and you'll see the load vcore.
vcore never changes when I run IBT or any other test
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