intel i5 4670k / Alpenföhn Brocken 2 - 99°C with 1.275V too high?

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Elblackwoodo

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Feb 15, 2017
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4,510
Hey guys! got a lil' question for you...

I recently started overclocking my cpu and bought myself a suitable cooler:
link

But now it still gives me over 90°C spikes with prime95 @ 1.250V cpu Vcore...(almost 100°C with 1.275V picture of Hw Monitor)
Is this normal or could I just installed the cooler wrong? (think I was pretty precise tho)

with a Vcore of 1.215 it gives me a nice below 80° on every core, but I hoped to be able to push it to its 1.3 limit with the new cooler.


My system:

Asus R9 270X
intel i5 4670k
Alpenföhn Brocken 2
Thermaltake (630W+80) (Berlin)
G.Skill DDR3 8Gb PC 1333 CL9
Gigabyte GA-Z87-D3HP
Samsung ssd 750 Evo 250G
WD 1TB Sata3 WD10EZEX
Windows 10 64bit

 
Solution
chenuki


You are correct. Small FFT is great for CPU/cache stability testing. Blended or large FFTs will test CPU+RAM overall stability and generate more heat, which may be closer to realistic max load usage. AVX...
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Elblackwoodo

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Feb 15, 2017
23
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4,510


yep you are right, it gives me a max. temp of 67°C while the others stay even lower. (new version+small FFT)

So I better test the stability of my overclock with small FFT settings?

But when my system overheats in large FFT settings, Isn't there a way that I will not knowingly overheat it myself? (gaming+using cpu heavy apps)
 
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chenuki

chenuki

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May 11, 2016
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1,960


You are correct. Small FFT is great for CPU/cache stability testing. Blended or large FFTs will test CPU+RAM overall stability and generate more heat, which may be closer to realistic max load usage. AVX is the unrealistic load, so we exclude that aspect by using version 26.6 over earlier.

If your average max load temp is reasonable with 26.6, I would not be overly worried about occasional spikes. But if you're still concerned you could check the thermal compound between heatsink and CPU for optimal contact. My guess is you may be hitting the ceiling in what the cooler/chip combo can handle at that voltage. Silicon lottery is unfortunately very real, and some chips just make more heat when pushed.

Hope this helps
 
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