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Trying to overclock a 4790k

post #1 of 29
Thread Starter 
Hey all, first post here. New to overclocking but I think i'm getting the basics. Running the aforementioned cpu on a gigabyte z97mx-gaming 5 board. Currently overclocked at 4.6 at 1.264v (stress testing now, so far so good). I'd like to squeeze out 4.7, or maybe even 4.8, while sticking underneath 1.3, 1.4v max. When I bump up to 4.7 on 1.264v, it blue screens. When I bump up to 1.27v, instant reboot. Am I at my limit or are there other options I should be looking at in my bios to try and squeeze out more power? My PSU is brand new and has been working flawlessly, and I have about 200w headroom left, so I'm not bogging my PSU out. Thanks in advance, looking forward to being an active member!
post #2 of 29
Thread Starter 
Apologies if this is considered a double post, can't figure out how to edit on here, under stress (prime95) my temps are only hitting low 70's with my corsair h100i v2 cooler, so i'm not overheating
post #3 of 29
Knowing your exact set up will help out a lot. What is your exact PSU brand? Also, you may need to increase your voltage a little bit more if attempting 4.7GHz. It may start requiring steps of .05V at a time, or even more. Every chip is different. Combine with PSU/motherboard being made different too, it is very hard to get exact numbers from another person.

Typically, just try to find the steps up to get stable, then you can slowly decrease voltage to find your perfect voltage and multiplier settings.

EDIT: The edit button is on the bottom left of your posts. It's next to the "Report" button
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post #4 of 29
i run my 4790k at 1.35V and 4.7GHz 24/7 (well i shut my pc down at night)

but i also have a custom water loop as well as the naked ivy kit which eliminates the heat spreader and the block is directly on the cpu die. load temps average in the 50's.

you'll need a bit more voltage most likely to get 4.7GHz stable. i can't even get 4.8 without getting to 1.4V.

if your cooling just isn't quite there, i'd stick with the 4.6 overclock you have now. the 100MHz difference is pretty small.
post #5 of 29
Welcome aboard smile.gif

Looking over in the Devil's Canyon Owners thread http://www.overclock.net/t/1490324/the-intel-devils-canyon-owners-club it looks pretty typical to need 1.3-1.35V to get 4.7-4.8GHz, if your chip will do it. Sometimes you just sort of hit a wall and no reasonable amount of voltage will do it hence the silicon lottery as it's often called. I put together a water cooled 4790K build for a friend a few months back and I was able to get 4.8GHz on 1.325V for her if I remember correctly, but again that's with water cooling and was still a little toasty in the upper 70's running Prime.

It can be helpful to get some cooling on the motherboard's VRM area for stability too. The voltage regulators start getting pretty hot as you pump more power through them and a little fan blowing over them wouldn't hurt. As mentioned above these chips are plenty fast at 4.6 and you probably wouldn't notice much difference pushing it a little higher. Still if you want to try for 4.7 or 4.8 give it some more power and watch the VRM temps as well as your core temps thumb.gif
 
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post #6 of 29
Thread Starter 
Something tells me my vrm is the source of the abrupt shut downs, so I'll have to keep them cooler somehow. Anytime I try to touch even 1.27 at 4.6 it just shuts down under load, no bsod or anything. Power supply is an evga 650 gq. I'd love to hit 4.8 but I don't think I won the lottery here
post #7 of 29
Thread Starter 
Also my previously mentioned stress test failed, I wasn't around to see why though, whether bsod or immediate shutdown
post #8 of 29
Quote:
Originally Posted by Spadz93 View Post

Something tells me my vrm is the source of the abrupt shut downs, so I'll have to keep them cooler somehow. Anytime I try to touch even 1.27 at 4.6 it just shuts down under load, no bsod or anything. Power supply is an evga 650 gq. I'd love to hit 4.8 but I don't think I won the lottery here

Is it shutting down within seconds or is it after a few minutes? It most likely isn't a temperature issue if it's immediate, that's more likely just not enough voltage. Some monitoring programs like Aida64 will show the VRM temp for most motherboards. You could have a look with that and it might tell you if something is getting too hot. Aida64 also has a built in CPU/GPU stress test that's a little less demanding than Prime if you wanted to start there.
 
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post #9 of 29
Thread Starter 
Going to snag aida64 to check. Checked my event viewer and it says I have an Event 41, Kernel-Power. Checked my prime95 results and the last thing in the log was a single "Self-test 16K passed!" about an hour after the stress test started, and around the same time the Event 41 happened. Something tells me that wasn't a bsod. There seems to be a very fine line between the system bsod'ing or just cutting power completely when it comes to the vcore. Hopefully aida64 will shed some more insight towards temps.
post #10 of 29
If your temperatures are under 85°C try 1.284v on the CPU voltage. I've had my computer shut off instantly from an unstable overclock or reboot instantly which is weird. Increasing VRIN (Input) voltage may help with overclock stability. E.g 1.7v-1.95v or slightly higher than it was previously.
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