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CPU Usage spikes down to 0% during stress testing (Intel Core 2 Duo E8400 3.00GHz OC)

Hey guys,

This is my first shot at overclocking my CPU. Began it all by installing a Noctua NH-U12P SE2 that I bought 2 years ago but left collecting dust on my shelf. The processor I'm using is an E8400 Wolfdale Socket 775 LGA chip that I got in 2009. My system is definitely in need of an upgrade, but I thought to myself, "Why not?" I can afford a new system if this one goes kaput on me, but I would definitely prefer to keep this around as long as possible =] (or at least until my GTX 260 dies on me so I can file an EVGA lifetime warranty claim xD).



As you can see, there are random spurts of CPU usage dropping to 0%. My pc also becomes temporarily unresponsive.

Is this an example of "instability" or is something wrong with my cpu? I will definitely have to try a long stress test with it on stock settings, will probably get to that sometime tomorrow.

Here's a CPU-Z screenshot of my setup:


It's OCed to 3.85Ghz with a voltage of ~ 1.450 or 1.425 (forgot what I set it up as in BIOS; I also have the feature that regulates voltage based on CPU usage enabled)

Finally here is a rundown of my temperature sensor test with RealTemp:




Again, I'm not too worried about this system, I'm sure I'll have a new one by the winter. I also reinstalled windows on my drive and moved all my old data to a backup drive.

Any tips on OCing these Wolfdale processors? My ram timing is set at: 6-6-6-17 and they've been set to run at 1066 (CPU-Z is reporting a frequency of 526.5 MHz and a ratio of 13:16 FSB : DRAM)


Thanks guys, and excuse my ignorance on the general topic. I have tried reading as much as I can on Overclocking CPUs. Up until now I've only toyed with the GPU.
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More about cpu usage spikes stress testing intel core duo e8400 00ghz
  1. Best answer
    Need to know the motherboard.
    I'm feeling it's either cpu temp or VRM throttling.
  2. schmuckley said:
    Need to know the motherboard.
    I'm feeling it's either cpu temp or VRM throttling.


    It's an EVGA nForce 750i SLI bored.

    Here's a link, except mine is not the FTW edition. http://www.evga.com/articles/401.asp

    I believe this is the manual for my specific board: http://jp.evga.com/support/manuals/files/122-yw-e173.pdf

    I'm assuming the FTW OCs relatively better than the standard SLI edition.
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