i7-8700k 5GHz OC?

peti0127 · Feb 2, 2018

So I'm experimenting with my new 8700k to get it up to 5GHz. I'm a beginner at OC, so I set now 5GHz @ 1,31V. I use AIDA64 for testing. The test looks fine for 30 seconds: 5GHz, 110-120W, 80 degrees Celsius. But then it gets limited to the TDP of 95W. Is this normal?

EDIT: read the temperature wrong, it got to max 80 degrees Celsius, before it turned down from 120W to 95W

https://prnt.sc/i9nshb So these are the 3 programs to test it, screenshot right after starting up the PC.

https://prnt.sc/i9nyb6 After 8:50 AIDA64, it was 110-120W in the first 20-40 seconds, then back to 95W. (BIOS CPU voltage setting @ 1,31V)

Cooler: Arctic Freezer 33 eSports one

sizzling · Feb 2, 2018

No, that's too hot. What cooler are you using? Try lowering the voltage. What temp did it go up to when stress testing at stock speed?

peti0127 · Feb 2, 2018

Stock speed was 70-75 degrees

agello24 · Feb 2, 2018

dont overclock on a stock intel cooler. people do it, but i would not suggest doing it.

peti0127 · Feb 2, 2018

agello24 :

I use an Arctic Freezer 33 esports one cooler.

1LiquidPC · Feb 2, 2018

Sounds like it's throttling a bit if AIDA is lowering TDP. Do you need 1.35v? Without delidding, these CPUs get hot around this speed and voltage.

peti0127 · Feb 3, 2018

Well I tried AIDA64 and Prime95, both of them turned it up to 120W and then after 30-45 seconds down to 95W. I'm not experimenting with lower voltage, but every voltage monitor shows a different result. Core Temp says 1,374V @5GHz, CPU-Z and the monitor of AIDA64 are different.

peti0127 · Feb 3, 2018

https://prnt.sc/i9nshb So these are the 3 programs to test it, screenshot right after starting up the PC.

https://prnt.sc/i9nyb6 After 8:50 AIDA64, it was 110-120W in the first 20-40 seconds, then back to 95W. (BIOS CPU voltage setting @ 1,31V)

1LiquidPC · Feb 3, 2018

Voltages and temps look fine. The 1.31v set in UEFI is the one to trust. VID is what CPU is requesting. What about software recording clock speed during tests to be sure you stay at 5Ghz. If so, i'd disregard the TDP listing.

sps02121985 · Feb 3, 2018

https://www.newegg.com/Product/Product.aspx?Item=37B-000B-001G8

^This will get you into the 5ghz with a delid.

The Original Ralph · Feb 3, 2018

assuming you applied the thermal paste properly, you might consider upgrading your cooler to a better quality one - i went to that cooler's website and it's heavy on "snake oil" description & self grandising, but not a lot of substance. They actually claim on the specs page it's rated for up to 300W, which is a little bit of a stretch

here's a review comparison - it's 5.5C degrees warmer than a Cryorig H7 at idle and 6.5 C degrees warmer under load
https://www.kitguru.net/components/cooling/dominic-moass/arctic-freezer-33-esports-one-air-cooler-review/5/

don't know why, but the Noctua coolers are not included - if your budget can handle it, that's what i'd go with

if your case can handle a 165mm tall cooler, here's one i'd suggest Noctua NH-D15 https://noctua.at/en/products/cpu-cooler-retail/nh-d15/specification

and a close second choice, if you need a 160mm tall cooler Noctua NH-D15S https://noctua.at/en/products/cpu-cooler-retail/nh-d15s/specification

if you compare just the weight of that cooler of yours to the Noctua 15s, the Artic is 680 grams while the Noctua is 980 g,
considerably more mass in the way of aluminum & copper to transfer that heat up and away from the IHS

If the Noctua is out of your budget, go with the Cryorig H7 - just make sure to check it's height with what your computer case mfgr shows it will accept
fwiw

USAFRet · Feb 3, 2018

sps02121985 :

Can we assume you've used this product?
Have any pics to show us?

sps02121985 · Feb 3, 2018

USAFRet :

You can find my photos of it on my rig on hardforum... All the hate on this forum for suggesting a delid has turned me off from even helping you people. Especially since it has been proven that a delid fixes the heat issues with these cpus.

USAFRet · Feb 3, 2018

sps02121985 :

So we're supposed to go searching all over the internet for pics of YOUR system?
I think not.

A delid is OK, if that is the actual solution to a problem, when you've exhausted everything else.. However, it is not the first thing you jump to.

peti0127 · Feb 4, 2018

I'm right now at 1,31-1,32V @5GHz, first 30 seconds 110-120W, then something limits it down to 95W and the clock goes down too.

peti0127 · Feb 4, 2018

I can't buy anything new for my rig right now, but I think the cooler should be enough. In the first 30 where I get constant 5GHz at 1,31-1,32V it gets to 75, max 80 degrees

peti0127 · Feb 4, 2018

What's VID? Do I have to set that for overclock too?

HOkay · Feb 5, 2018

It really sounds like your temps, maybe try a lower clock speed & voltage (4.6@1.25v perhaps) & see if you get the same power reduction.

Your cooler is almost certainly too small for a heavily overclocked 8700k, they really pump out the heat!

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