4790K Stress Testing and Overclocking

After running my 4790K at stock speed for over 2 weeks without any issues, I decided to go ahead and have a shot at overclocking.
This is the procedures I used.
1. Started at 4.5 Ghz and 1.250v (manual) ran Aida64 CPU stress test for 10 minutes (no Problems) Max Tempertures were 60c, 63c, 59c, 58c, on each core According to Core Temp 1.0Rc6.
2. Bump to 4.6Ghz @1.250v, Ran Aida64 again for 10 minutes (no problem) Max temps were 63c, 63c, 60c, 58c, ( I ran the stress twice, the second time i ran it for 15 Minutes)
3. 4.7Ghz @ 1.250v, same test with out any problem, Max temps were 62c, 66c, 60c, 59c.
4. 4.8Ghz @ 1.250v Received Blue Screen of Death when Windows 7 was booting up.
5. 4.7Ghz @ 1.250v Received same crash Windows failed to boot. Note that I had already ran a successful boot at these settings.
6. 4.6Ghz @ 1.250v Windows booted up ran Aida64 for 6Hours Twice! Temps 60 62 60 59.
7. 4.7Ghz @ 1.300v Ran Aida64 for 6Hours temps were 65 68 67 61.
8. 4.8Ghz @ 1.300v Blue Screen Crashed Windows 7 Failed to Boot
9. 4.8Ghz @ 1.325v Ran Aida64 Over Night (7 Hours Straight), Played Battlefield 4 Maxed (No issues). Maximum Temps where 69 71 69 64.

My Build Specs are as following
Windows 7 64bit Pro
Asus z97-AR Mother Board
8GB 1600 DDR3 Single Stick
Intel 4790K with H100i Water Cooler
Samsung XP941 512GB PCIe SSD M.2 2280 (gaming)
Samsung 840 Pro SSD 128GB for OS Only
4 HDD 4TB Each
2 SLI Gigabyte GTX 970 G1 Gaming Grapphics Card (they already come oc)
hx750i Corsair PSU.

Now this is my problem. after believing that my overclocked was successful as I was happy with system stability and the CPU core temps were in my belief not out of the norm, I came across this post ( which says that you need to stress test the CPU with Prime95 v 2.66 Small FFT and avoid Aida64 in order to get a meaningful CPU temp.

Well every time I run this test the temperatures on all my cores shoot up to 84c within the first 15 Seconds, then usually right after 21 seconds i get the blue screen crash!!!!. by the way the Vcore setting is set to Adaptive.

Any ideas on what should I do? other than this Small FFT Stress test No other stress test i run on my system seem to be able to crash it.

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  1. Best answer
    Normally, you should be getting lower temps with prime95 version 26.6 that with aidai64 since the aidai64 uses floating point units to stress the cpu. From personnal experience, my i7-4790k with h100i will stay in the low to mid 60s with prime but will go up in the low to mid 70s with aidai64' FPU test enbaled along with the others. If i run FPU alone, it spikes up to 85.

    Did you try running prime with Vcore set to manual? as it can sometimes pull too much voltage in adaptive mode.

    And you dont "need" to stress test the cpu with prime to confirm a stable overclock, its just good practice. If every other stress test youve ran where fine and it stays stable while doing the most cpu intensive things you'll be doing on a daily basis. ie running games for a while, then youre probably good.
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