fauzool

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Alright so I looked up plenty of info and all that and I OC my PC I run Prime95 for 10 hours+ no errors. But Im not sure if this is a problem or not, but when I start up CPU-Z or Everest and look at my CPU Core Speed it is Switching from 3.8 to 2.4 MHz. I OCed to 3.8GHz I am Using Intel Core 2 Duo Wolfdale. What I want to know is why it keeps switching like that. Please let me know if you need any additional information to help me with this problem.

Thanks
 

SpidersWeb

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It's called Intel SpeedStep.

When your processor isn't being used it underclocks itself. This saves power and extends processor life time.

If you keep CPU-Z open, then start Prime95 and do a test, you'll see the frequency instantly jump up to full speed :)

Doing some math I guess you've got an E8500 at 400Mhz bus? 400 x 6 = 2.4Ghz, 400 x 9.5 = 3.8Ghz.
Same chip I use, I love the things.
 

fauzool

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Yup thats correct E8500. I also tried OCing to 4 Ghz, but I think my mobo is stoping me from doing that. What do you think? I have P5QL Pro mobo not really for OCing.
 

SpidersWeb

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Should be fine. Asus make good boards. Its a P43 which I haven't used, so I can't be certain, it could also be your RAM if you only have DDR2-800 etc.

I'm using a cheap Gigabyte EP45-UD3LR.

I was using an Asrock originally (not a fan myself), I just needed a small bump in Vcore for 4Ghz, once I got past 4 the voltages/difficulties go up quite quickly. Not worth it for most people as you wont really notice the diff between 200 or so Mhz. I can't help myself though.
 

fauzool

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Well I tried boosting CPU Volts to 1.4, Ram 2.0, NB 1.4 left everything else same and It wont boot to xp. So its my Ram most Likly then? I have 2 Gigs DDR2-800 would 3 Gigs help or...?
 

SpidersWeb

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If it boots to the BIOS, then chances are the RAM is handling it.
I found with RAM if it doesn't work, it wont start, just gives three beeps and that's it.

You shouldn't need quite so much voltage on the NB, I do 533Mhz on 1.28V without issue. I ran my Asrock P45 at 1.5V, and it didn't last long I'm affraid.

Something you can try is a little extra VTT, keep it as far under 1.4V as you can though. Have seen lots of accounts of > 1.4 killing processors (mostly quads). I'm doing my o/c with 1.3V VTT.

If you find you are having to use excessive voltage to get to 4Ghz, then I'd go for a higher end board. Fighting too hard with voltage for a daily PC can be a bit of a risky game and often not worth it. That's what happened with my Asrock, so now I limit myself to stay within a certain range.

Should also point out, check out the overclocking core 2 duo and quads sticky thread at the top of the overclocking section. Much more information in there :)

Also may be more people who can post up with more experience. I'm no overclocking god or anything.