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i5 2500k OC Help

post #1 of 6
Thread Starter 
I just built a system yesterday around an i5 2500k and tried out overclocking for my first time. I was able to get to 4.2 ghz @ 1.27 volts. I read on some guides that getting to 4.5 ghz @ 1.3 volts is pretty standard so I thought I would give it a try. My pc is able to start up and enter the bios, but then my windows 7 won't load and I'm stuck at a black screen with a flashing line at the top right corner. I'm not really sure what's the problem here, any advice would be appreciated
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CPUMotherboardGraphicsGraphics
i5 2500k 4.2 Ghz @ 1.264v MSI P67A-GD53 Asus GTX 780 Evga GTX 780 FTW w/ Kraken G10+H55 
RAMHard DriveHard DriveOS
8 gb G. Skill Sniper 1.5tb Hitachi Deskstar 7k3000 Crucial MX100 512 Windows 7 Ultimate 
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First Build
(15 items)
 
  
CPUMotherboardGraphicsGraphics
i5 2500k 4.2 Ghz @ 1.264v MSI P67A-GD53 Asus GTX 780 Evga GTX 780 FTW w/ Kraken G10+H55 
RAMHard DriveHard DriveOS
8 gb G. Skill Sniper 1.5tb Hitachi Deskstar 7k3000 Crucial MX100 512 Windows 7 Ultimate 
MonitorPowerCase
QNIX QX2710 XFX Pro750w XXX Edition Phanteks Enthoo Pro 
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post #2 of 6
Not every chip is the same and some require more voltage than others, some chips can't even get to 4.5.

Keep bumping up the VCC a few notches until you can boot into Windows, then run your preferred stress test for 12-14 hours. If you pass that and you don't run into any BSODs, you're golden.
post #3 of 6
also keep your VCore under 1.52 :-) personally id keep it under 1.4 for air cooling
post #4 of 6
Thread Starter 
Thanks for the quick reply, I'll try bumping up the voltage next time I give overclocking a go.

Another question about stress tests, I have both prime95 and Intel Burn Test, is there a difference between these two? I read that prime95 needs to be run for at least 8-10 hours for good stability readings but then Intel Burn Test can do it in an hour? I would prefer to go with Intel's tester because of the time factor since I can't keep an eye on my computer for an extended period of time.
First Build
(15 items)
 
  
CPUMotherboardGraphicsGraphics
i5 2500k 4.2 Ghz @ 1.264v MSI P67A-GD53 Asus GTX 780 Evga GTX 780 FTW w/ Kraken G10+H55 
RAMHard DriveHard DriveOS
8 gb G. Skill Sniper 1.5tb Hitachi Deskstar 7k3000 Crucial MX100 512 Windows 7 Ultimate 
MonitorPowerCase
QNIX QX2710 XFX Pro750w XXX Edition Phanteks Enthoo Pro 
  hide details  
Reply
First Build
(15 items)
 
  
CPUMotherboardGraphicsGraphics
i5 2500k 4.2 Ghz @ 1.264v MSI P67A-GD53 Asus GTX 780 Evga GTX 780 FTW w/ Kraken G10+H55 
RAMHard DriveHard DriveOS
8 gb G. Skill Sniper 1.5tb Hitachi Deskstar 7k3000 Crucial MX100 512 Windows 7 Ultimate 
MonitorPowerCase
QNIX QX2710 XFX Pro750w XXX Edition Phanteks Enthoo Pro 
  hide details  
Reply
post #5 of 6
Correct, P95 does take much longer to determine stability compared to programs such as LinX and IBT. Both stress much harder and raise temperatures higher as well.
post #6 of 6
Quote:
Originally Posted by dummy12 View Post
Thanks for the quick reply, I'll try bumping up the voltage next time I give overclocking a go.

Another question about stress tests, I have both prime95 and Intel Burn Test, is there a difference between these two? I read that prime95 needs to be run for at least 8-10 hours for good stability readings but then Intel Burn Test can do it in an hour? I would prefer to go with Intel's tester because of the time factor since I can't keep an eye on my computer for an extended period of time.
in my honest opinion Intel Burn Test is WAY over kill. prime 95 blend test is more then enough some ppl here are just freaks. run prime for 12 hrs if it does not fail your good. also i only stress test mine for like 2 or 3 hours tops.
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