i5 2500k Overclocking heat problems and fluctating Core speed

ReydanNL · Mar 17, 2016

Hey all,

It's the first time i tried to OC my I5 2500k last night, and it didn't go quite well as planned. I want to OC my i5 2500k to 4.5Ghz. During Prime95 tests my CPU max temps where around 80 degrees, and my RAM where around 89 degrees!

I've set the multiplier on 45 and Vcore on 1.36V, because of Vdroop. In CPU-z it will show my Vcore, while running Prime95 in Blend mode, as 1.328V.

But there is another problem, my Core speed in CPU-Z keeps fluctating. It's never stable around 4500Mhz. It's mostly around 3500Mhz sometimes going up all the way to 4300Mhz...

So i am really confused right now, and i don't know how to go any further. To sum it up:

1. I have heat problems on CPU and RAM.
2. My Core speed is fluctating.

My computer specs:

i5 2500K
ASrock p67 Extreme 4
Scythe Mugen 2 cooler
GTX 570 Twin Frozr II
Corsair AX750 PSU
8gb of RAM

I hope anyone can help me.

bhupeshm · Mar 17, 2016

Can you tell me which cooler are you using on your cpu? And from there we can proceed further

ReydanNL · Mar 17, 2016

I have a Scythe mugen 2.

bhupeshm · Mar 17, 2016

Ok here are my two giveaways:

1. Lot of heat - The cooler is not a major setback however since its an aircooler and depending on the ambient temperatures of your room it will have its limitations and you are already on 1.36 volts which is in reality will generate heat. I would say even if you stress testing and stay under 80 or at 80 then its fine.

2. about your core speed fluctuation = Check your C1E states or speedstep setting in the bios, disable them both - these settings can push back the cpu when there is not enough load on it. let me know if you need any further assistance.

ReydanNL · Mar 17, 2016

bhupeshm :

Thanks for the answer.

1. I've set 1.36V in the BIOS settings as Vcore. So it isnt really 1.36V right? Because CPU-Z is showing a different voltage while running Prime95, 1.328V.

2. Currently Intel Speedstep Technology is enabled. Turbo boost power limit on Auto. C1E enabled, C3 and C6 disabled. C state support disabled. CPU thermal throttling enabled.

Thanks for helping me.

4Ryan6 · Mar 17, 2016

ReydanNL :

1. A 2500K with only one graphics card to run a 45X multiplier that is too much voltage should be 1.325v. or less.

2. you do not have the BIOS settings right.

http://www.tomshardware.com/forum/id-2012433/sandy-bridge-series-multiplier-overclocking.html

After you are stress test stable, use this.

http://www.tomshardware.com/forum/id-2345618/reaching-cpu-overclocking-stability.html

azzazel_99 · Mar 17, 2016

Hmm those volts seem awfully high. My 2500k i just yanked out of my system and put in my wifes never went over 1.26vcore and it was at 4.4ghz and never went over 58c. Also i would try using occt or aida64 for stability testing. Try lowering your vcore and see if you're stable at lower voltages. Your's seems awfully high. Im fairly certain mine was at 1.26v with c1e turned off and the speedstep turned off. Also had vdroop set to low in my msi bios options and i was using a hyper 212evo.

ReydanNL · Mar 17, 2016

4Ryan6 :

Thanks for the reply! Still confusing i might say. Because everyone is suggesting different things. But it looks really solid because its thr exact same motherboard as i have.

Anything i need to think about when doing these settings?

4Ryan6 · Mar 17, 2016

I cannot speak for other guides, mine works!

I wrote the guide using the same motherboard so yours will probably act the same as mine did, read the guide all the way through first, then follow any special instructions to the letter.

I used the same guide to overclock my 2500K to 5.1ghz and my 2700K to 5.3ghz, of course that was with better cooling than you are running.

Your present air cooler can easily handle 4.5ghz.

ReydanNL · Mar 17, 2016

4Ryan6 :

Well its worth a try

. I havent really read anything that suggested all those settings. Thats what makes things confusing, if you know what i mean. Will try it this weekend.

I am going to clear my case from dust before. Just to make sure the airflow is a bit better.

4Ryan6 · Mar 17, 2016

Good idea, case air flow is very important!

Also check your cooler for dust, it might not be a bad idea to remount it with fresh Thermal Compound if it's been at least a year since it has been done?

The guide has worked for everyone that has used it to my knowledge, I have received numerous PMs from those thankful I wrote it, so I have no doubts at all it will work for you as well.

ReydanNL · Mar 17, 2016

4Ryan6 :

1 year? Lol make that 5. I have no experience with that. I am just starting to read into it, because i want to pump it up. So i can run it a little faster for a few more years. So i guess i will have a busy weekend!

4Ryan6 · Mar 17, 2016

ReydanNL :

Thermal compound dries out over time and looses a lot of it's thermal conductive properties.

ReydanNL · Mar 17, 2016

4Ryan6 :

So i need a new cooler or juste new paste?

bhupeshm · Mar 17, 2016

ReydanNL :

1.36 Volt is very high as I said before however please try to disable C1E and speedstep technology these are the primary reasons which fluctuates your core multiplier and secondly as Azzael said u need to drop the vcore a little bit and then keep stress testing and check what is the point where your cpu meets the best frequency with best temperature and also keep in mind not all CPU are same so it might be a case where your cpu demands high voltage but wont give you the proportionate multiplier (otherwise known as silicon lottery)

ReydanNL · Mar 17, 2016

bhupeshm :

ReydanNL :

1.36 Volt is very high as I said before however please try to disable C1E and speedstep technology these are the primary reasons which fluctuates your core multiplier and secondly as Azzael said u need to drop the vcore a little bit and then keep stress testing and check what is the point where your cpu meets the best frequency with best temperature and also keep in mind not all CPU are same so it might be a case where your cpu demands high voltage but wont give you the proportionate multiplier (otherwise known as silicon lottery)

Have you seen the guide posted above? I think that guide is exactly what you are saying aswell. I will let you know this weekend

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