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Windows, Cpu-z, Core temp all show incorrent multiplier for overclocked i5-2500K

post #1 of 14
Thread Starter 
Hey all,

This has been a very frustrating night. I have spent the past 6 or so hours trying to work out this problem to no avail. Basically my problem is with windows not recognizing my overclock at all. I have a Gigabyte z68x-UD3H-B3 motherboard capable of overclocking, and I have an intel i5-2500k. So the hardware shouldn't be the problem. The computer is up and running perfectly and so I decided to set up my manual overclock. I have set the overclock multiplier ratio to 45 in the bios for a 4.5ghz overclock. I am able to successfully boot windows with a vcore voltage of 1.32 or higher with this multiplier.

Now the frustrating part that I can't seem to find any information on. When I first open CPU-z it recognizes my multiplier as 45. If c3/c6 is enabled this is quickly reduced to 16 for power saving *which I like* but it will never return to 45 even when stress tested. This is the weird part, if I start a stress test like Prime95 the multiplier will reduce itself to 34 and stay there. 34 isn't even the normal base multiplier considering the i5-2500k comes stock with 33. Core temp and windows also give me the same multipliers and ghz numbers.

So long story short does anyone know the problem? Am I simply not creating a stable overclock (even thought the computer never crashed)? am I actually overclocked and these programs are giving me incorrect numbers? (which would suck because how will I ever know if my computers performance is enhanced if I can't measure it.) Is my clock multiplier randomly slowing down from some sort of bottleneck? Is that possible? Thanks in advance to anyone that reads all that and tried to help me out.


-disabled c1/c3/c6 state support power options
-turned on/off turbo
post #2 of 14
Have you disabled intelspeed step?

Comps
post #3 of 14
Thread Starter 
Yeah CPU EIST function has been disable as well.
post #4 of 14
But when overclocking Sandy Bridge, it's better to leave CPU C1E and Enhanced Intel Speedstep Technology enabled.

With the Z68 chipset, CPU Spread Spectrum is usually better left disabled.
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It's a computer!
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post #5 of 14
Quote:
Originally Posted by TwoCables;15380469 
But when overclocking Sandy Bridge, it's better to leave CPU C1E and Enhanced Intel Speedstep Technology enabled.

With the Z68 chipset, CPU Spread Spectrum is usually better left disabled.

this^
 
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Thuban Powah!
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post #6 of 14
when I was 1st OCing my i5 and z68xp-ud4 it would do stuff similar

set to 45x, idle down to 16x and then in P95 it would use 33x or there abouts, not sure exactly which setting fixed it but disabled C1E , C3+C6, EIST
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post #7 of 14
I would suggest turning off speedstep and turning it back on and report your findings for each one.

Also, if you could post some pics of your bios it would help us help you immensely.
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Azura
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post #8 of 14
Thread Starter 
Thanks for the suggestions everyone. After a little more tinkering I simply decided to start from scratch and reset the bios. After an hour or so of tinkering I seem to have a stable 4.5ghz clock at 1.38v. I think I was making it more difficult on myself and trying to change to many options. Basically the only options I changed in the BIOS were, Multiplier to 45x, I turned turbo off (for the cpu), and I put the voltage up to 1.38 (the highest voltage I felt safe with). After this setup refused to boot into windows I began to feel entirely defeated. Maybe I had gotten on of the few poor overclocking i5's. I gave it one more chance and decided to systematically shut off some of those power options again. What do you know after shutting off just only EIST it booted into windows. After an hour of prime95 the highest temp I have seen in 63 C.

At this point should I be happy with my relatively stable overclock? Or should I continue to lower the vcore voltage until it doesn't boot into windows then go up .010 and then run a full night of prime95?
post #9 of 14
Lower it to the lowest possible voltage you need to get into windows and then p95 custom blend with 90%+ of your ram adjusting voltage until you can get atleast 12-24 hours complete. You can still use your computer while doing this so don't shortcut this step.

During my 12 hour blend I watched a ton of tv shows/movies and did a lot of web browsing.

Also it's highly recommended to keep the powersaving features minus c3 and c6 reporting on as well as speedstep and turbo. It's your call but these features are nice to save some power and extend the life of your cpu.

Basically what I would do is this: Turn back on speedstep, turn on turbo, turn on c1e, set your llc to 75%, set pll voltage to 1.7, set vcore to manual and find the lowest possible voltage you need to reach your desktop.

Then run a custom prime blend of 1344 - 1344 FFT with atleast 90% of your ram and 1 min for each FFT. Do that for 15-20 mins. If you can pass then do a custom blend test with 1792 - 1792 FFT with atleast 90% of your ram and 1 min for each FFT.

If you get an error increase vcore 1 notch at a time until you can pass both of the above steps. Record down your manual voltage that allowed you to pass the tests.

Once you pass, go back into your bios and set the voltage to offset and adjust the offset voltage until you can get pretty close to the manual voltage you recorded. CPU-Z tells you your voltage. You'll have to do a quick prime test to put your cpu on load to see the voltage.

Once you're at the voltage start a custom blend test with just 90% of your ram and let it run. Adjust vcore as necessary until you can pass 12+ hours of it.

P.S.

Once you get it stable don't forget to sign up for the sandy stable club. Link is in my sig. Lot's of good info in there as well about overclocking our chips.
Edited by stilllogicz - 10/20/11 at 6:52pm
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Azura
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post #10 of 14
Thread Starter 
Keeping Intel(R) Turbo Boost Tech on won't mess with my manual overclocking? I have read almost everywhere to shut this off when manually overclocking. What is the benefit of keeping this on?

Currently C1E,C3, and C6 are all on anyways. I kind of like the 1.6ghz idle to save power. Would turning off C3, C6 really be to my benefit for what I loose? The only reason I disabled the CPU EIST function in my bios is because windows doesn't seem to start at all with it on, even up to 1.38v. Basically my goal was to hit 4.5ghz so I started there and slowly raised the voltage until it booted into windows. I did not want to go over 1.38 vcore so when I hit that peak and it still didn't boot into windows I shut off only EIST and that allowed my system to boot into windows. I am already down to 1.36v with windows booting still trying for lower. But once I enable EIST again it will not boot windows. Problem with EIST? Or just some weird combination of BIOS settings

*P.s I really appreciate the help!
Edited by Enderzt - 10/20/11 at 7:20pm
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