Question about Stress Testing

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newoverwatchemail

Apr 3, 2018
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I have an overclock on my i5-4690k running at 4.5 Ghz and 1.186V. On prime95 Blend, I get temps sitting at 80 degrees, but on the Small FFTs test, I got temps upwards of 90-95 degrees. I know that gaming won't cause temps as high as the synthetic tests, but should I still lower my overclock anyways?
 
Solution
Barty1884
Prime95 (newer versions anyway) also heavily stress the AVX instruction set. Unless your workload will utilize AVX, then small FFTs is overkill as far as a "stress test" goes.

Personally, no, I wouldn't look to lower clocks. Most people need in the 1.2-1.25V range for 4.5GHz. If you're only at 1.186V (and have a suitable motherboard & adequate cooling), you should have plenty headroom to push on beyond 4.5GHz. 4.6, maybe even 4.7GHz *might* be doable. 1.3V, IIRC is the upper-end of "safe" for a DC CPU.

*No guarantees on 4.6 or 4.7, of course.... but with that much voltage headroom, you've got a better change than most.
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newoverwatchemail

Apr 3, 2018
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Are the temps too hot?
 
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Barty1884

Barty1884

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Prime95 (newer versions anyway) also heavily stress the AVX instruction set. Unless your workload will utilize AVX, then small FFTs is overkill as far as a "stress test" goes.

Personally, no, I wouldn't look to lower clocks. Most people need in the 1.2-1.25V range for 4.5GHz. If you're only at 1.186V (and have a suitable motherboard & adequate cooling), you should have plenty headroom to push on beyond 4.5GHz. 4.6, maybe even 4.7GHz *might* be doable. 1.3V, IIRC is the upper-end of "safe" for a DC CPU.

*No guarantees on 4.6 or 4.7, of course.... but with that much voltage headroom, you've got a better change than most.
 
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newoverwatchemail

Apr 3, 2018
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Thanks I am not technical enough to understand all that

 
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J_E_D_70

J_E_D_70

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Mar 21, 2012
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Many here wouldn’t agree, but I’m comfortable with Blend-stable. I’ve never had cpu temps in games go above what that generates so...

But... I’d watch gaming temps and if you are up around 80 a lot would look at better cooling. I’d be more comfortable in the 60-70C range for gaming.
 
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Barty1884

Barty1884

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Don't worry about it too much, it's mostly over my head too :lol:
Basically, if you *need* AVX, you'd know about it.

I guess a really basic way to look at it would be Prime95 stresses 100% of the CPU.
In 'normal' people's usage, only, say 80% is ever used. So for the purposes of "real world" stress testing, you're interested in your temp results when stressing 100% OF the 80%.

If you will never, no matter the circumstances, use the other 20%... it's irrelevant in determining your stable temps/clocks/voltage.

Hopefully that makes some form of sense?
 
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terry4536

terry4536

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Mar 28, 2010
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You will have to determine what temperature is too hot. Most people assign a max temperature in the 80 - 85 C range for the max overclock. But if you want you can keep going till it crashes (after all it is your property).
 
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10tacle

10tacle

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Dec 6, 2008
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What cooler are you using and does your case have good airflow? You can see my 4690k overclock specs below running a Noctua NH-D14 cooler all inside a modified Antec Nine Hundred case. (I cheated on that CPU-Z temp stamp by putting my PC out on the deck when it was 35F outside, lol).
 
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