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i5 2500K being downclocked under stress testing, help please

post #1 of 10
Thread Starter 
I'm attempting my first overclock and it started off easy enough but then I ran into a weird issue. First of all, I'm running an i5 2500k with an ecs P67H2-A2 motherboard, and since this is my first time overclocking a cpu, I was following this guide:

http://www.tomshardware.com/forum/265056-29-2600k-2500k-overclocking-guide

So far I have just been up-ing the multiplier/cpu ratio and stress testing with prime95. I got it up to 41, and half way through the test and realized both CPU Z and Real Temp were reading a multiplier of 40...so I thought maybe i accidentally forgot to save the changes in the BIOS. Oh well, finished the test, rebooted back into the BIOS only to see that it was in fact set to 41. So I changed it to 42 and rebooted back into windows for some more stress testing. That's when I realized without the stress test running, both CPU Z and Prime 95 read 41 (even though it was set to 42) and when I run the test it is down clocked even further to 40. What could be causing this? Temps across the 4 cores are ranging from 52-57 degrees so I don't think it's a heat issue.

According with he above guide, I did the following in the bios before I began:
Disable:
Limit CPUID Maximum
Power Technology
C1E Support
OverSpeed Protection
Spread Spectrum


Enable:
Internal PLL Overvoltage
Execute Disable Bit
Intel Virtualization Tech

With the exception of the two colored ones above. I couldn't find "OverSpeed Protection" in my BIOS, I'm guessing it's under a different name but not sure what that would be? And the "Spread Spectrum" was grayed out and next to it says "enabled". I don't know how to go about disabling it?? Could these be my issue?


P.S.
I again just tried a multiplier of 43 and got the same results. At idle, both programs read 41, and under stress they read 40.
post #2 of 10
Thread Starter 
I just noticed that if I disable either EIST (speed step) or turbo mode I loose the ability to adjust the CPU Ratio. With both of those enabled (as I have been testing), I also noticed that if I change the CPU ratio from the factory 33 to something else, I loose the ability to enable/disable the "internal CPU PLL OverVoltage" option AND the 4 individual "Core Ratio Limits".
post #3 of 10
Sounds like your CPU might be thermally throttled, what temps are you hitting?
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post #4 of 10
Thread Starter 
Temps were hitting about 52-57 under full load. However (without fully understanding this) I found a review online of the motherboard which states this:

The "IA Core Current" option is most critical; with it set to normal, you may set clocks to whatever you wish, however, the CPU's multi will lower under load in order that the CPU's current consumption meets a pre-determined limit that will change from CPU to CPU. Power limit values and multipliers are both customizable here, but do keep in mind the "IA Core Current" setting will override both multi and power limit options as we just mentioned.

So I changed it to max (it has either normal or max options) and it let me keep raising the multiplier. UNTIL I hit anything above 4.4, when the same thing started happening. If I choose 4.5 or 4.6, it clocks down to 4.4 under load. Temps at these speeds are about 59 degrees.
post #5 of 10
Thread Starter 
One more thing I am seeing is that the core voltage (as displayed by CPU Z) drops from 1.308v to 1.248v during a stress test. I'm not sure if that's normal, but it seems backwards to me. Shouldn't the voltage go up if anything during a stress test?
post #6 of 10
Quote:
Originally Posted by SilverJester View Post

One more thing I am seeing is that the core voltage (as displayed by CPU Z) drops from 1.308v to 1.248v during a stress test. I'm not sure if that's normal, but it seems backwards to me. Shouldn't the voltage go up if anything during a stress test?

well, that depends on what your LLC level is set to. If you have it set really high, it will raise vcore during load, if you have it set very low or turned off, you will see the normal vdroop whilst under load.
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post #7 of 10
You may have to set your turbo power limits.

399

Set power limit 1 and 2 to 150 and report back.
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post #8 of 10
Thread Starter 
Quote:
Originally Posted by Hacksword View Post

well, that depends on what your LLC level is set to. If you have it set really high, it will raise vcore during load, if you have it set very low or turned off, you will see the normal vdroop whilst under load.
Ah ok so it is normal then. It just seemed odd to me, but I'm glad to hear it's not. Thanks!
Quote:
Originally Posted by munaim1 View Post

You may have to set your turbo power limits.
399
Set power limit 1 and 2 to 150 and report back.
I actually just figured that out...well sort of lol. With my motherboard came some software by Intel called XTU, which is kind of like a windows based overclocking program. I tried running the "autotune" mode but it eventually seemed to get stuck in an endless loop. However, one of the first things it did was change the power limits (although it changed them to 278....is that safe??), and I've been trying to figure out what those were (actually XTU calls them "turbo boost power max" and "turbo boost short power max"). The other thing it changed was somethiing it calls "Core Current Limit" from 0mV to 0.08mV (again is that safe??). I've been trying to figure out what these things were but it seems XTU has unique names for these.

By changing those 3 things I have been able to surpass the 4.4ghz mark, but kind of scared since I didn't/don't know what they actually do.
post #9 of 10
I would not trust software overclocking... I would make the changes in the bios only. With regards to core current limit, the CPU is only going to draw as much as it needs. It is not forcing more current through, it is allowing it to not trigger the safety feature built in when it exceeds TDP. You will be fine, just don't try and set it to 7Ghz or anything smile.gif
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post #10 of 10
Thread Starter 
Great I did what you said and left it at home stress testing at 4.6ghz smile.gif
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