Did I get an insanely cherry picked i7 4790k haswell refresh?

Hardware Hub CPU
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So my processor so far has been amazing me. It's been able to overclock to 4.8ghz on just 1.296v.

Today, I decided that 1.18v at stock just wasn't low enough, and I wanted to go even lower. I so far have managed, stock 4.4ghz @1.136v, and I'm definitely gonna try to go lower.

**** Edit. Final number is: 4.4ghz @ 1.088v ****

Is this normal for a haswell refresh?? I'm just so surprised because my previous CPU --i5 2500k-- needed so much more voltage just to hit the same clocks.

Here's the score.

crazy%20haswell%20refresh_zpsx2j5gnds.jpg797x775

Here's proof of it at 4.4ghz turbo @ 1.136v, in the middle of the test.
(and the stability has been tested with AIDA64)

crazy%20haswell%20refresh%202_zpsuumux4fg.jpg1024x739

** I'll update the topic with new pics if I'm able to get even lower **

1 Like
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idk mine says its at 1.199 for 4.4 i have not tried to overclock since i do not have proper vrm cooling. that 1.8 seems extremely high

edit: I see he edited it.

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sorry i didn't mean 1.81v(typo), It was 1.18 at stock at first. Then i got it down alot.

Got it down to 1.12v @ 4.4ghz stock

crazy%20haswell%20refresh%203_zps0k2nej1x.jpg841x870

4

Don't you mean 1.31v? No way it was 1.8 without LN2

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Edited 1.18 instead of 1.81... lol

Now down to 1.12v @ 4.4ghz

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4.4ghz 1.104v

Before test finished.

crazy%20haswell%20refresh%205_zpshaghxymi.jpg737x866

After test

crazy%20haswell%20refresh%204_zpswqscsqi1.jpg787x873

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Alright anything lower than this will cause a blue screen

4.4ghz @ 1.088v

middle of the run

crazy%20haswell%20refresh%207_zps0xcndunc.jpg721x786

finished

crazy%20haswell%20refresh%208_zpsancfumxp.jpg747x693

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I had an i5-4690K that was similar to this.

http://valid.x86.fr/y7q9bl

At those speeds I'm in the top 50 results for the XTU benchmark on HWBot. Cool to see Intel parts that aren't limited to 4.4Ghz as a lot of modern K series parts have been.

Oh, and since I could: http://valid.canardpc.com/7uaqpw

Tagged with my friend's name since I sold the chip to him along with the board about a day later, and he wanted something to show to his friends. Was a blast to OC!

Late edit: Didn't want to make this about me, just showing that YES Devil's Canyon chips seem to be extremely well binned or have really high yields over Haswell, because a number of them just OC like crazy. Enjoy yours! If you're feeling brave you can even shoot for that 5.0GHz for the bragging rights!

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How does the CPU fare under AVX workloads? From my limited knowledge on the subject, that looks like a really sweet chip you got.

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FiggyG3h
How does the CPU fare under AVX workloads? From my limited knowledge on the subject, that looks like a really sweet chip you got.

You mean, when compared to other 4790k processors at stock voltage? Or the chip in general?

In synthetic tests, my 4790k is pretty much identical to other stock ones that I compared it with.

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I know mine can do 5ghz. But it requires over 1.4v to do so. It booted into windows at 5.01ghz @1.39v, but it crashed while benchmarking it.

So yeah... Not really comfortable with pumping that much voltage in my CPU. I want it to last me a couple years at least.

12

possible if you disable your igpu. While I don't own haswell, i can speak about i5 2500k and i7 3770k;
on stock voltage my sandy bridge i5 could go up to 4.9GHz... ~ 5GHz but it was getting fairly hot at this point.
on i7 i can easily push with stock volt to 3.6GHz but heat generated is too much... as there's power leak in ivy bridge arch.

1 Like
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As part of testing temps & stability of your overclock. AFAIK AVX workloads can really ramp up the temps.

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From what I'm understanding SiSoftware Sandra CPU benchmarks use AVX. That's what I used to test it.

Edit: I ran the SiSoftware Sandra CPU benchmark titled "Cryptography" with HWmonitor open.

CPU temp got up to 62c at 100% load. Package wattage was 76.51 watts. Not sure if that's the power being drawn by my CPU or the measured TDP? (which should be 88?) I don't really understand HWmonitor all that much...

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Oh DOH! I forgot to disable my iGPU when I tried that 5ghz overclock. I'm gonna give that another shot this weekend.

Thanks for the reminder. xD