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i5 2500k Overclocking to 4.5ghz

post #1 of 26
Thread Starter 
Hello Gents,

I'm OCing my i5 2500k on an ASRock P67 Pro3, and I can't seem to run Prime95 Blend Tests past a few minutes until one or more cores gets an error.

I ran 20x LinX, no problems, temps never reached above 66C. The temps are actually lower when running Prime95, mostly around 60C, and max at 63C, but either one or two threads has an error after a couple minutes or so.

Is this a memory issue I'm facing? I'm currently running at the following settings in UEFI:

Vcore: 1.28v
BCLK: 100
Multi: 45
Memory Voltage: 1.5v (as per recommended settings)
9-9-9-24
* Underclocking the 1600mhz memory to 1333mhz

Any help?
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post #2 of 26
have u tried upping ur vcore?
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post #3 of 26
Try bumping up the vcore a little bit and try again :-).

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post #4 of 26
Thread Starter 
I've tried upping my vcore to 1.29 in increments of 0.05 (so, 2 tests), and it seems its worse (?). I get a BSOD after 2 minutes, while the other setting just had one or two cores give an error, and the others still running w/o problems.
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post #5 of 26
You should clear BIOS and stress test at stock speeds and report back.

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post #6 of 26
Thread Starter 
How long should I run tests on stock? 1h is fine for prime blend tests?
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post #7 of 26
I run 4.5GHz on 1.425 vcore lol. So try upping that but not that high and see if your core fails. I had the same problem, core 3 would always fail. But it doesn't with more vcore and maybe clocking your ram down a notch.
 
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post #8 of 26
Quote:
Originally Posted by Dustin1 View Post
I run 4.5GHz on 1.425 vcore lol. So try upping that but not that high and see if your core fails. I had the same problem, core 3 would always fail. But it doesn't with more vcore and maybe clocking your ram down a notch.
1.425 for 4.5Ghz? Wow... Have you tried reducing the PLL voltage? That helped me stabilize my chip at 4.5Ghz with less voltage than I was using.
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post #9 of 26
Thread Starter 
I'm currently underclocking my ram as it is, from 1600 to 1333. Should I aim for lower until I can get a stable OC?

Also, I haven't played around with PLL overvoltage. Its currently set to disabled. I just wanted to run by you guys if I should overvolt the memory, or if you think one core failing (yeah, mine is the same problem, core 3 failing) is a vcore issue.

I'll up the vcore and report back, but just wanted a clear yes/no on if I should be concerned with the memory voltage yet?

Thanks.
Zaid's SB i5
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i5 2500k ASRock P67 Pro3 EVGA GeForce GTX 570 HD Fermi 732MHZ 1280MB G.Skill Ripjaws DDR3 1600 CL9 (2x4GB) 
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Zaid's SB i5
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CPUMotherboardGraphicsRAM
i5 2500k ASRock P67 Pro3 EVGA GeForce GTX 570 HD Fermi 732MHZ 1280MB G.Skill Ripjaws DDR3 1600 CL9 (2x4GB) 
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post #10 of 26
Thread Starter 
Quote:
Originally Posted by Dustin1 View Post
I run 4.5GHz on 1.425 vcore lol. So try upping that but not that high and see if your core fails. I had the same problem, core 3 would always fail. But it doesn't with more vcore and maybe clocking your ram down a notch.
What was the minimum vcore you were able to boot into windows and just get core 3 failing with? Just wanted to compare and see if I'm doomed to up the vcore to that high for 4.5ghz stable...
Zaid's SB i5
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k ASRock P67 Pro3 EVGA GeForce GTX 570 HD Fermi 732MHZ 1280MB G.Skill Ripjaws DDR3 1600 CL9 (2x4GB) 
OSPowerCase
Windows 7 64bit Antec TruePower New 750W HAF 922 
  hide details  
Reply
Zaid's SB i5
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k ASRock P67 Pro3 EVGA GeForce GTX 570 HD Fermi 732MHZ 1280MB G.Skill Ripjaws DDR3 1600 CL9 (2x4GB) 
OSPowerCase
Windows 7 64bit Antec TruePower New 750W HAF 922 
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