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Can't Overclock Sandy Bridge Past 4.5ghz

Hi i'm new to this forum so please forgive me if i do something or say something wrong. Anyways i'm having trouble overclocking my i5 2500k. For some reason i can't overclock past 4.5ghz. Whenever i go past, save the settings, and reboot the computer the screen turns black and there's a flashing line(identical to a damaged mbr). I'm pretty sure that my mbr is not damaged because when i set my cpu ratio back to 4.5ghz and reboot the computer everything is fine. I'm just wondering if i have the wrong settings or its a hardware related issue.

Settings:
CPU Ratio: 45(anything higher the problem occurs)
C1E - Enabled(Someone on youtube says this protects the cpu, turned it off and still had the same problem)
Spread Spectrum - Disabled
CPU Core - 1.35v
Turbo Boost Power Limit(Manual) - 200,230
Core Current Limit - 230
LLC - Level 4
CPU PLL(Auto) - 1.85
BCLK - 100.0mhz
Internal PLL Overvoltage - Disabled


Specs.
CPU: i5 2500k
MB: Asrock P67 Extreme4
CPU Cooler: Noctua NH-D14
RAM: G.Skill Sniper 8gb(2X4gb) 1866mhz
HDD: Western Digital Caviar Black 1tb
Video Card: Sapphire Radeon 6950
22 answers Last reply Best Answer
More about overclock sandy bridge past 5ghz
  1. Sorry bud but your just being greedy
  2. spentshells said:
    Sorry bud but your just being greedy


    i not sure but 4.5ghz on a sandy bridge is easy to achieve. a lot of people who have an i5 or i7 sandy bridge seem to overclock past 4.5ghz. also with the nh-d14 it should be possible
  3. sdm5 said:
    i not sure but 4.5ghz on a sandy bridge is easy to achieve. a lot of people who have an i5 or i7 sandy bridge seem to overclock past 4.5ghz. also with the nh-d14 it should be possible


    While it is possible on many processors, you may just be unlucky and yours just will not go over 4.5.
  4. Oh i didn't know that some cpu's could overclock better than others.
  5. I have the same cpu and mobo. 4.4 is stable, but at 4.5 it will reboot after 10-20 mins.
  6. brentkhack said:
    I have the same mobo and 4.4 is stable, but at 4.5 it will reboot after 10-20 mins.


    What is your vcore?
  7. sdm5 said:
    What is your vcore?


    This is the computer that was the $1000 build from march that I won. Tom's had the same problem with 4.5 and I am getting the same results. But I have tried auto and 1.35
  8. I'm not sure, cuz i believe 1.35v is enough for 4.5ghz or even higher. i reached 4.5ghz on my first try in overclocking at 1.35v and it was stable.
  9. Best answer
    Try enabling CPU PLL Overvoltage. Sometimes that can help increase an overclock. If not, then you've likely hit your CPU's multiplier wall.
  10. I'm running the same M/B and CPU as you, try my suggestions in my sig link, you have nothing to loose to try it, you definitely have the cooler to handle the heat, if it doesn't work for you go back to the settings where you are now.
  11. Best answer selected by sdm5.
  12. Leaps-from-Shadows said:
    Try enabling CPU PLL Overvoltage. Sometimes that can help increase an overclock. If not, then you've likely hit your CPU's multiplier wall.


    Thank you Leaps. i enabled my Internal PLL Overvoltage and everything worked perfectly. Now time to get a 7.9 wei. Thanks again.
  13. 4.7ghz seems to be my multiplier wall with PLL Overvoltage enabled. oh well, guess i'll never reach 5ghz.
  14. I was looking for 5.0GHz too, but my 2500K's overclock stops at 4.6GHz with CPU PLL Overvoltage disabled, and 4.8GHz with it enabled. And I can't even get it there with BCLK overclocking -- when the multiplier is raised, my board won't boot when I increase the BCLK.
  15. Yea i was kinda disappointed that i couldn't push my cpu further. I just keep on getting the bsod everytime i go higher than 4.7ghz. No matter what voltage i put it on i still get the bsod. So i just stopped and stayed with 4.7ghz, but now i have a nh-d14 and i think i could of went with a cheaper heatsink at 4.7ghz. On the bright side my temps are really cool, my highest temp on intel burn test on very high is 79c.
  16. sdm5 said:
    Yea i was kinda disappointed that i couldn't push my cpu further. I just keep on getting the bsod everytime i go higher than 4.7ghz. No matter what voltage i put it on i still get the bsod. So i just stopped and stayed with 4.7ghz, but now i have a nh-d14 and i think i could of went with a cheaper heatsink at 4.7ghz. On the bright side my temps are really cool, my highest temp on intel burn test on very high is 79c.


    79C is waaaaay to high. I would stop doing the stress test and be happy with what you did :D
  17. brentkhack said:
    79C is waaaaay to high. I would stop doing the stress test and be happy with what you did :D



    I am happy with what i did. Really 79c is way to high?!! My temps at idle is at 32c it's just when i'm doing the test on very high mode. Also i hear that intel burn test stresses your cpu a lot more than any other program, so if thats true i should be good cuz the safe max temp for a cpu is 75c.
  18. 79ºC isn't "way too high" for the CPU. It's higher than I would expect for 4.7GHz with an NH-D14 cooler though. What CPU voltage are you running?

    Also, try setting your CPU PLL voltage to 1.7 and see what that does to your stability and temps. I found that my system stayed rock solid and the temps lowered by a couple of degrees when I tried that setting. I'm still running it that way now.
  19. Well i just used the intel burn test on maxium and got the bsod and tried to lower my CPU PLL Voltage to 1.7 and still got the bsod. My core voltage was pretty high too, at 1.39v. So i went back to 4.5ghz at 1.325v and now my maxed temp is 73c.
  20. http://hardforum.com/showthread.php?t=1578110

    1. Approximately 50% of CPUs can go up to 4.4~4.5 GHz
    2. Approximately 40% of CPUs can go up to 4.6~4.7 GHz
    3. Approximately 10% of CPUs can go up to 4.8~5 GHz (50+ multipliers are about 2% of this group)

    Other decent SB OC Guides:

    http://www.xtremesystems.org/forums/showthread.php?264847-Ultimate-Sandy-Bridge-OC-Guide-P67A-UD7-Performance-Review

    http://www.clunk.org.uk/forums/overclocking/39184-p67-sandy-bridge-overclocking-guide-beginners.html#post110904

    http://benchmarkreviews.com/index.php?option=com_content&task=view&id=730&Itemid=38

    The last one is one you should check regarding temperatures. I agree with the author that 4.4 is the proverbial sweet spot for everyday usage. I have Son No. 3's set up under a BIOS profile at this setting on the 2600k w/ HT enabled. Then there's a 4.8 "Gaming Profile" which he can load for extreme gaming w/ HT disabled....temps run about 72C (Thermalright Silver Arrow).
  21. Well lets say in my opinion, anything over what the manufacture says for max safe temp will be way to high. There is a reason why they tell those to do not go over "x" temp or volts so the end user will not burn out a cpu that they may or may not get a rma on. Plus it will help the manufactures so the end user will not blast them for when it does blow up for something that isn't their fault.
  22. Hey guys i did some more researching and found a way to overclock past 4.7ghz or what i though was my multiplier wall. I found out that my LLC had to be set at level 2. Now i can overclock my chip to 4.9 but at over 1.4v so i backed down because i hear any voltage over 1.4v is not a safe everyday overclock. I also change some of my other settings to match a person's at another forum, but they said changing LLC to level 2 was really important. Hope this helps some of you guys.

    Source/Link: http://www.techpowerup.com/forums/archive/index.php/t-144822.html
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