Prime95 - CPU Z showing speed dips?

MrMartyn1984

MrMartyn1984

MrMartyn1984

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Hi.

Installed my new FX6300 the other day, was testing out Prime95 and no matter what speed it's set on (I've overclocked to 4.4 but this happens with stock speeds) it'll go full speed and then for a second it'll dip to x15 (3000mhz) and then back up to full speed for a few seconds then dip again an continue doing so?

Any ideas.

Have reset bios and even on stock settings it does this?

Idles at 28 and when running prime gets upto 50 degrees
Motherboard is an M5A88-v evo.

Never seen this happen with my Phenom II 550.
 
Use Realtemp/Coretemp for more accurate temps. Certainly sounds like some kind of throttling going on
 
My FX4100 throttles exactly the same as you're describing and after Googling for literally hours the only way I could get a stable clock without it throttling was to install AMD Overdrive and then each time I boot the machine I turn on turbo boost and then disable it.....Run prime and it no longer throttles.

Don't know if it will be the same with yourself but may be worth a try?
 
Kidge said:
My FX4100 throttles exactly the same as you're describing and after Googling for literally hours the only way I could get a stable clock without it throttling was to install AMD Overdrive and then each time I boot the machine I turn on turbo boost and then disable it.....Run prime and it no longer throttles.

Don't know if it will be the same with yourself but may be worth a try?
Click to expand...

Amazingly this works! I now find my CPU hitting 61 degrees under load and it sits at a solid 4444MHz in CPU Z :)

I'm guessing that's a bit too hot for my CPU so am now wondering if it needs slowing down due to my cooler.

I take it there's no way to auto enable/disable the turbo at start up rather than having to do this at each boot?
 
Haha it was a shot in the dark, but great to hear. I want to say its an issue with the mobo but mines completely different so i haven't a clue.

Unfortunately Im not aware of an auto on/off away around it but you could make overdrive open on start up and this will save a little time.........all be it still a very annoying issue!!
 
Well as annoying as it is having to turn turbo on and then off and also load my saved profile to put it back to 4.4(mine resets to 4.1?) it does the trick and works.
 
haha yeah I suppose it's better than throttling. It may be worth updating your bios too although i done this to my mobo and the issue still occurred it may be different on yours?.

But then you'd be doing that at your own risk........
 
MrMartyn1984 said:
Amazingly this works! I now find my CPU hitting 61 degrees under load and it sits at a solid 4444MHz in CPU Z :)

I'm guessing that's a bit too hot for my CPU so am now wondering if it needs slowing down due to my cooler.

I take it there's no way to auto enable/disable the turbo at start up rather than having to do this at each boot?
Click to expand...

Prime 95 is just a stability tester. You are unlikely to experience those temps in day to day usage over six cores so I would not worry. 61C is within spec anyway.

It may be an idea to try and cool the VRM area of the motherboard if these are getting hot but otherwise it sounds like you have a good 4.4GHz overclock. Did you disable turbo in bios?
 
Yeah turbo is disabled in bios but then I'm having to enable and disable it in AMD overdrive (as above) to get the clock rock solid.

Thought it might get a 7.9 in windows experience thing, it gets 7.6.
 
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