Upgraded CPU. Reaches 100C within 2 seconds fan won't go full speed

Dogoid · 11 Sep 2019 at 15:46

Got a used I7 4790k to replace an i5 4690k , notices in game and benchmarking temps go to 100c near instantly so i reseated fan, same thing. Went into BIOS and enabled fan to be full at all times, still fan ( stock i5 cooler ) wont rev up past 2100RPM.

with i5 i had no probs with temps , load 65-70C.

I am using the i5 stock cooler with the i7 BTW.

Dogoid · 11 Sep 2019 at 16:10

Yes it is, but it was great with i5, and before i get another cooler i want to rule out defective die temp sensor etc. my CPU fan wont go full speed even at 100c

Dogoid · 11 Sep 2019 at 17:20

EsaT said:
Likely combination of crappy Intel buzzaw with its crappy mounting, possibly broken/worn because used, and possibly Intel's bubblegum/toothpaste under heatspreader going bad.

Something like this would be huge upgrade:
https://www.overclockers.co.uk/raijintek-aidos-direct-contact-cpu-cooler-hs-002-rt.html

just might get that, cheap enough. cheers.

Dogoid · 11 Sep 2019 at 18:51

No speeds don't change with fan at all stays 2100RPM. When i bench and leave it for a bit putting my fingers on the heatsink isn't that hot.

It gets 100C in 2 seconds.

Temps go down very fast yes.

Tried SpeedFAN, can't even manually alter fan speed. Just ON/OFF Software controlled or Smart guardian.

Dogoid · 11 Sep 2019 at 20:03

Put the i5 back in now, and temps aren't as erratic. Not shooting to 100c like the i7.

Dogoid · 12 Sep 2019 at 10:07

pastymuncher said:
It should be noted that the 4790k never came with a heatsink .

That's interesting, i never knew that .

I've ordered a contact cooler , see how that goes.

Dogoid · 13 Sep 2019 at 20:21

Just to update , i got the Cooler Master Hyper TX3 EVO. today and everything is spiffy now, i undervolted the I7 from 1.2 to 1.15v and has been stable all day with load temps around 69C - 73C. big difference from 100C last night.

Thanks for all your help.

Dogoid · 14 Sep 2019 at 15:13

labcoattech said:
Do you notice any difference in temp if you raise the voltage to 1.2v

Yeah by 3 or 4c

Dogoid · 14 Sep 2019 at 15:16

ANDARIAL said:
Still seems a bit hot
I had a 4790k a while back and granted i was cooling with a dark rock2 it ran at 4.7 all cores 1.27volts and idled at about 40oC +- ish depending on room temps

Well right now it's idling around 32C , i was playing BF2 last night 64 players and sometimes it dipped into the high 60's , as you said , ambient temps play a big part too

Dogoid · 15 Sep 2019 at 11:57

Alsone said:
Result although it's still hot. Might be worth de-lidding if adventurous. Depends on risk vs reward to you. Can always look on the bright side though, at least your room will be warm this winter.

I was looking at some videos on delidding, seems quite strait forward , knowing me though, i'd **** it right up

Dogoid · 16 Sep 2019 at 13:48

Just lowered my Vcore on the i7 from 1.15 to 1.12 stable and under 100% load temps dropped to 66C from 70C. I wonder if i can go lower?