CPU Being Throttled

Ipwnnubletz · May 19, 2010

I'm new here, I just found this forum. Please go easy on me.

My CPU is apparently being throttled by my Asus P7P55-M motherboard. I have a Core i5 750 overclocked to 3.6GHz (200x18, 1.2v), and everything was working fine for a few days until I noticed the throttling. The multiplier goes down to 9, making the frequency 1800MHz instead of the desired 3600MHz, but just for a few seconds (5 seconds maybe), then it goes back to 3600MHz.

My temperatures are well within safe (60C running IntelBurnTest on Maximum), and C-States, C1E, Turbo and SpeedStep are all off. All powersaving features are off and I'm on the Performance preset in Windows 7's power options. I have a 700W PSU, it should be able to handle my i5 just fine. Anyone know why this is happening?

tinymouse2 · May 20, 2010

Does the same thing happen in Prime?
Could just be the IntelBurn test requires no load at certain times.

Just as a side question: what 700w PSU have you got?

Ipwnnubletz · May 20, 2010

tinymouse2 said:
Does the same thing happen in Prime?
Could just be the IntelBurn test requires no load at certain times.

Just as a side question: what 700w PSU have you got?

Nope, it doesn't happen in Prime, only apps running LinPack. It's not that IBT requires no load, because the CPU's usage percent just goes down, and as you can see in my screenshot, the usage is 100%, but at 1800MHz.

I've got the OCZ StealthXStream 700W PSU.

tinymouse2 · May 20, 2010

Maybe just updating issues?

Monitor it in real world usage (games, video encoding or whatever you're using the pc for). If the problem still persists while those things happen then there's something up.
Until then I doubt anything's wrong with your CPU.

Your PSU isn't on the recommended list but it's not on the blacklist though. The reviews elsewhere seem alright though. The only bad thing is a possibly bad 5v rail. Even so it's a pretty standard PSU and miles better than those crappy ones that come with pre-built PCs

Randyman... · May 20, 2010

I use the i7 Turbo Utility to see the actual multi's going on - CPUz and others seem to incorrectly list the multi at times when no throttling is actually happening.

http://www.softsea.com/download/i7-Turbo.html

Check it with that app and I bet you are fine...

Ipwnnubletz · May 20, 2010

Randyman..., I'm 100% sure that I'm being throttled, why else would IntelBurnTest be reporting a lower Gflops score than when I'm not being throttled?

Randyman... · May 20, 2010

Ah - I missed that part (don't think you mentioned it

and your pic was re-sized to be almost illegible - EDIT - That was my browser doing the image re-sizing - sorry about that assumption

) - but I do absolutely see CPUz indicating throttling (looks like C1E behavior) when the i7 Turbo Utility indicates a solid 22x multi the whole time with my i7 860. Just an FYI...

Also, the i7 Turbo Utility has a check box to disable C1E (seems to override BIOS!) - but it doesn't seem like that is your issue.

That is a weird one. All I can come up with is that something else is stealing cycles during the stress test. Have you ran the stress test with your Task Manager open?

tinymouse2 · May 21, 2010

I'm still going with my original answer

Even if some cycles were being stolen it shouldn't throttle itself.

Joeteck · May 21, 2010

By default C1E is enabled in BIOS, its an energy saving function. I have mine enabled here @ work purposely. It an E4500 oced to 2.75GHz from a stock 2.2Ghz. However, @ idle is runs a mere 1.5Ghz. If you disable C1E, it will not slow down any longer.

Ipwnnubletz · May 21, 2010

Joeteck said:
By default C1E is enabled in BIOS, its an energy saving function. I have mine enabled here @ work purposely. It an E4500 oced to 2.75GHz from a stock 2.2Ghz. However, @ idle is runs a mere 1.5Ghz. If you disable C1E, it will not slow down any longer.

I've stated multiple times already, C1E is OFF, and the CPU only throttles when it is on high load.

tinymouse2 · May 21, 2010

If that was true it would be throttled while priming...

Nhut Pham · May 22, 2010

maybe you're the same as this?

wingman99 · May 22, 2010

Do you have the newest bios update for your Asus P7P55-M

CPU Being Throttled

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