i7 4790k overclock help

leekeene

leekeene

leekeene

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13 Aug 2015
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Ok so i had left my machine alone at 4.7 ghz for a while and temps are not going above 71'c and thought maybe i can get a little more from it.

i have tweaked the GPU already which is a Powercolor r9 390
added 9% to volts
GPU Clock from 1010mhz to 1080mhz
memory clock speed from 1500mhz to 1610mhz.

i tried to get the GPU clock up higher but it wasnt having any of it started to get some weird graphical bits happening that looked like minecraft rain during the demo i was running which was sky dive on 3dmark.

anyway now i have the GPU sorted what do i do to the CPU as i have totally forgotten. i went to bios and changed the multiplier from 47 to 49 to get 4.9 ghz exited and saved went back to bios and it said i was at 4.9 ghz but the vcore hadnt changed.

can some one help me tweak my machine please









 
so been reading for the last few hours (probably should so some work) am i right in thinking this is the correct process

adjust my multiplier up and leave vcore alone, test system and check for stability and heat. if stable increase again

once the system become unstable do i then increase the vcore a smidge and retest. keep increasing until stability is back. then repeat the above until happy or reach the maximum for a haswell vcore

that that correct?
 
gave it a try last night and failed not got a clue 4.8ghz and 1.29v and the thing would get through 3dmark ok but if i ran real bench 2.41 it would crash.

now things i had changed was i flashed bios to f8 from f7 and had tried to use the easytue software.

basically it would just restart my pc so i watched it for a while and then noticed it came up with a windows error saying it was creating a dump to send off no idea where this is saved?

i uninstalled the easy tune and went back to bios tuning and set it up exactly as before 4.7 ghz 1.255v vcore

it still crashed real bench at which point i was annoyed so i removed real bench and flashed bios back to f7 setup again as before went online and got latest real bench 2.42 and now its passing the test

not sure if it was bios or real bench playing up i did start getting error from real bench saying no disc in drive etc

so question is now do i try again

i want to keep the temps below 75'c

i have read everything on this forum with regards to the i7 i have but i just need to get confirmation on what i am actually doing. in my mind i need to do the following

1) up ghz to 4.8
2) boot system and run real bench and 3dmark see if stable and temps below my 75'c limit
3) if pass go back to step 1 and up to 4.9 keep repeating until it crashes
4) when the above fails adjust the vcore up 0.005v and retest from step 2 keep doing the volts until its stable or my temp gets to high

is that correct or am i going to kill my system ?
 
Sounds about right.

4.8ghz is an ambitious target, most won't get there under 1.3v

75c is pretty conservative. Low 80s are fine under realbench.
 
There isn't really a universally accepted maximum.

Some dont like going over 1.3v, some 1.35v, some even push up to 1.4v (though that's pretty hardcore stuff there)

Personally I'm running my 4790k at 1.22v because I'm hitting 83c in realbench at that already (or at least I was in the summer)

I'll be happy to go up to 1.35v when I'm de-lidded and running custom water though. I doubt I'll go any higher, unless 5GHz is achievable a tiny bit higher or something, then I'd do it for the e-peen lol.
 
Mine is running at 4.8GHz @ 1.33v 24/7 with no issues. Temps rarely exceed 75 on my H110i GT.

I did pretty much exactly the same, set multi to 48, set volts to 1.32 adaptive (0.010 offset) and cache to 39. I pretty much followed these steps here

I got it to boot at 5GHz @1.35v but it wouldn't last long and eventually even that wasn't enough and it would need close to 1.4v at which point I threw in the towel.

I would love to go custom water on mine and delid....maybe in the future!
 
So I can make a stable 4.8 GHz at 1.3 vcore

Tried 4.9 and it crashed on send run of real bench at multitask stage with a vcore 1.335 temp gpt to 74'c wasnt to sire if I should press on or not
 
Awesome, I would leave it there, not a bad result! You can keep pushing obvs but be wary of degradation!
 
Yes think your right which means my next plans to remount the water cooler on the front with 4 fans to make CPU cooler won't be needed

What is de-lid?
 
take the headspreader off the top of the CPU, replace the crappy thermal paste intel used between the bare CPU die and said headspreader, and replace if with good stuff (usually liquid metal).

Obviously has risks, I killed my 3570k trying to do it with a blade.
 
Delidding means slicing the integrated heat spreader of the cpu's pcb with a knife, or placing the chip in a vice and hitting the ihs with a peice of wood and a hammer. However you can now purchase a tool that will slice it off much safer. Once this has been done you clean off the intel applied paste. Then for best results use coolaboratory liquid metal paste. Temp drops of 20c arent uncommon. You can replace the heat spreader by either using a suitable adhesive or just allow the pressure of the coolers base to hold it in place. Some watercooling companys supply a shim which allows you to run the chip without the heatspreader, theese prevent the waterblock from crushing the cpu die. This is also known as naked mounting. Obviously though delidding can have its risks and it will invalidate the warranty.
 
Agh OK that make sense

Cheers

One question from my stable 4.8. If I got a stable 4.9 what is that really achieving me here. Extra 10 fps? I dunno what 100mhz is in the computer world

It feels like when I was car tuning and chaisng numbers again which a small increase was nothing
 
Higher numbers in benchmarks, overclocking the cpu doesnt make a massive difference in game frame rates.
 
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