How to test OC when prime95 get's the cpu too hot?

Enderegg · Dec 27, 2014

I got a FX-8320@4.3GHz and 1.4V being cooled by an H110.

Now, I get to 68ºC performing the test, peaked to 69 but ok, about 10 minutes but only makes it hot in the first 4/5, not sure why.

I've played BF3 for maybe 30minutes and it won't go past 50C, almost all the time at 45C.

It seems stable, but I want more, and I wanted a tool that would test out the CPU but that wouldn't heat it so bad.

Thank you

vrumor · Dec 27, 2014

The whole point of stress testing it is to get it hot, to stress it. That is what prime95 does and is the best for that purpose. If its getting too hot, you need to fix your cooling, or dont OC so much.

mdocod · Dec 27, 2014

I suspect you might be reading the wrong temperature....

A properly installed and working H110 would keep an FX-83XX well under "50C" (reported core temps) when running just 1.4V@4.3ghz... More than likely, you are observing SOCKET temps, which are influenced heavily by VRM power dissipation. The installation of AIOCLCs effectively REMOVES the OE designed VRM cooling system. In your attempt to provide your CPU better cooling with a big water loop, you have inadvertently handicapped the VRM cooling.

The "cool down" you are observing after running P95 for a few minutes, is the motherboard forcing the CPU to drop down to a reduced power state as a self preservation measure. (15X multi).

I suspect it's an Asus motherboard... M5A97? M5A99?

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My advise would be to solve your thermal problems. Part of being stable with an overclock is knowing that every component in the chain can handle a worst case scenario continuously, including VRMs.

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I run an FX-8350 at 4.4ghz most of the time on an Arctic A30 with an upgraded fan. I need almost exactly 1.40V under load to be good and stable (long P95 runs) at this speed. CPU core temps fluctuate from 48-52C with different rounds of testing with my MUCH smaller HSF (and those temps could be lower if I adjusted the fan control to be more aggressive, it's not even running full speed!)

My Socket temps typically reach ~55-60C with such settings, and this is WITH active cooling installed both front and rear of the motherboard:

Enderegg · Dec 27, 2014

M5A97 Evo R2.0

Yes, I'm looking at socket temps. The core temp is always much lower than the "CPU" temp. Either way I think I got a CPU that can't go more than this. Tried 4.4GHz with 1.25V and just after running a couple of seconds I get one core stopping in prime 95.

Any more tips?

Thank you a lot for the descriptive answer

mdocod · Dec 27, 2014

The M5A97 is not well suited to overclocking the 8 core parts, as it is limited by the 4+2 phase voltage regulation, however, if you install a fan as pictured above over the VRM heatsink, you should note a marked improvement in reported socket temps. As it stands currently, it sounds to me like you are throttling to 3.0ghz under a load because the motherboard is overheating without any air-flow. I highly recommend installing active cooling on your motherboard for best results.

The setup you see above with fans both front and rear is on an M5A99X EVO R2.0, which includes a 6+2 phase voltage regulation design with better quality components. Even that board will jump to ~70C+ and throttle back the CPU from 4.4ghz to 3.4ghz (the next P-state for the 8350) without those fans installed.

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The UD3P would have been a better choice in the price class of the M5A97 as an overclocking board.

Enderegg · Dec 27, 2014

I have the 6+2 Power phase one. Now I was playing NS2 at 4.3GHz, and it doesn't go over 40C. And that is a CPU intencive game. That's why I asked to how to check OC. I saw a video of Tek Syndicate with this board going to 4.6, that's why I got it. Much regret. Well, good enough for me.

You have been very helpful. Thank you.

mdocod · Dec 27, 2014

If you have the 6+2 phase version (I forget about that version of 970 as it wasn't available here in the states through most of it's production), then you should have no problem running 4.6+ghz, but ONLY IF you put ACTIVE COOLING (fans) on your VRMs!

Asus AM3+ boards have their temp monitoring for the socket/VRM area adjusted to be hyper-sensitive/conservative. This is a good and bad thing. It means the boards are very hard to destroy unless those protection features are circumvented. It also means that we have to apply more aggressive cooling to the VRM/socket area than we might on other similar boards to get the same results without throttling.

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How to test OC when prime95 get's the cpu too hot?

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