Problems on first time overclocking on 4790K

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Veyrah

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Feb 22, 2014
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Hello guys. I recently upgraded from a 4th gen i5 to a i7 4790K. I own a Msi z87-g41 pc mate motherboard. I have tried overclocking but without much success. I have an AIO watercooling system that keeps my cpu at around 28 degrees celcius at stock idle, ~ 38C at normal load (game+chrome running) and 50 while running something like Cinebench R15.

So that's some background information. I thought I'd have plenty of room for overclocking. I set the clock to 4.8Ghz at around 1.3 volts and the pc literally just doesn't turn on. I tried setting the voltage a bit higher but to no avail, just doesn't turn on. I set the voltage to auto. It boots, but windows gives me error messages immediately on startup.

So I started lowering the overclock to a conservative 4.6Ghz at a voltage of 1.25. Doesn't turn on. In auto voltage it boots but again immediate crash when booting into windows.

In the end all I managed was an increase of 100Mhz to 4.5 at auto voltage. This boots into windows...

Anyone has some idea of what I might be doing wrong?
 
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Barty1884

Barty1884

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Apr 16, 2015
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By "not turning on", is it attempting to? Typically, you'll see lights/fan activity for a brief second.
If there's just no life to it at all..... that's...... strange.

For what it's worth, the "auto" voltage aspect (depending on the chip/vendor etc) can be quite high on Devil's Canyon CPUs. Actually pushing 1.27V or so through a 4790K isn't unheard of via "auto"... and that's stock speeds.

Pure speculation on my part here:
You may well be dealing with a BIOS limitation (where it sees "stock" 4.4Ghz @ 1.27V as 'normal'), stopping you pushing less voltage @ higher clocks, and stopping itself going >1.3V for higher clocks..... which is definitely going to be what an "auto" functionality pushes through the chip.

Are you on the latest BIOS revision? I'd start there. Take a look around for some sort of "over-voltage" protection option. Hopefully you can raise a cutoff (say from 1.3 to 1.35V until you land what you want to use). Not 100% sure if that level of tweaking is available though, it's usually "enabled" or "disabled".

Definitely start with a BIOS update if available. You'd need v1.6 for the 4790K to even work on that board, so you're on at least that version. 1.7 and 1.8 exist though, so there's a possibility you're on any outdated BIOS revision..... although 1.8 did come out in July/14
 
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V

Veyrah

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Feb 22, 2014
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4,510

Hey, thanks for the reply!

I understand that I have been a bit vague about the "not turning on". With saying it doesn't turn on I mean the light and fans go on for a few seconds and then shuts down before anything appears on screen.

I updated to the latest version (1.8) before seating the CPU. I currently am able to run 4.6 by setting all voltage modes to override instead of adaptive, keeping the VCCIN at auto and Vcore at 1.25 manually.

Weirdly, 4.6 at 1.3 just doesn't work, like my CPU/motherboard isn't fond of higher voltages.

Been trying 4.7 at 1.25 and 1.35 and everything inbetween but it won't work. At lower voltages it does seem to have an easier time booting, as 1.27 gets me into windows but shuts down shortly after logging in. Anything higher just gives me BSOD after the windows loading icon.
 
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