i7 4790k computer shutdown when turbo enabled.

pleein123

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Jun 22, 2014
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Title says it all. When I go into bios and turn my turbo on or to default the computer will randomly shut down (NO bsod) and turn back on by itself during prime95. When I disable it, it is fine. I've heard that this might be a problem with my mobo (gigabyte) and that I should update the BIOS. Any idea what it could be other than that?
 

pleein123

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Jun 22, 2014
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Turbo mode only increases it from 4.0 to 4.3 and is part of the marketed option. It is not an overclock but an actual included tweak already provided by intel. I dont think that I should need to be playing with voltage in this case.
 

T3rm1

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Dec 27, 2010
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It looks like I have the same problem. I have a 4790K installed on a Gigabyte Z97X UD3H and my PC randomly restarts. There is no bluescreen.

I disabled the turbo modus in bios and haven't had a restart for 2 hours now. Not sure if it fixed it.

What can I do to use the turbo modus again? Have you solved your problem?
 

pleein123

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Jun 22, 2014
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haha I don't know if I fixed it but it stopped doing that. If you go into the bios and check the voltage going into cpu, it is most likely at "auto". My mobo was pumping in something like 1.29V into my cpu at stock cores which is way too much. So i lowered it to about 1.09 and overclocked my cpu to 4.4Ghz and it is pretty stable. I havn't done any elongated torture tests but it was running on prime95 for 30 minutes without breaking 65c (Except when prime95 suddenly jumps to 3.5million iterations as one of its tests, the cpu jumpes like 15c in that part of the test). Gonna do a more thorough test to check for stability at the end of the week.

Also, its not set at 4.4 base clock. I set it at 4.2 base and tubo'd it to 4.4 so it stays at 4.4 unless I start using all 8 threads, which then decreases the clock down to 4.2. (Thats how turbo works).

Don't use the same voltage or clocks as me because its pretty specific to each individual card. First thing I recommend to do however, is to find the lowest voltage that you can get a stable 4.0Ghz on with that card. I would start at like...1.5V (Mine didn't even start up at 1.05V with turbo on). and then keep going up in increments of like .125V.
 

T3rm1

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Dec 27, 2010
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Thanks for your answer. I will try it tomorrow. You said you lowered it to 1.9V but it was 1.29V before. Is it a typo or am I misunderstanding something?
 

Pr3di

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It`s a typo, the same as recommending 1.5V I think.
On my i5 4670k I`m at about 1.2v with 4.0Ghz overclock.
I have a back overclocked, but on the i5, I would not go any higher than 1.3V.

So do some reading, and check out what is a safe margin. If you`ll use 1.9, or 1.5V, you might even burn your CPU.
 

T3rm1

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Dec 27, 2010
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Couln't solve my problem yet. I tried it with Turbo on/off, lowered Vcore, disabled C6/C7 and turned on "power loading". I always get a restart right after Windows has started and the system is idle for about 60 seconds. This happens 3 to 4 times.
However, if I immediately start Prime95 after system start it won't happen. I let it run for about 1 minutes and after that the system is stable.
 

pleein123

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Jun 22, 2014
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Reset your BIOS to default and tell me what happens.