delidded 8700k suddenly getting hot

greenbrucelee · 28 Jul 2019 at 22:07

I bought all my components last year from overclockers and got a delidded 8700k (I got the 4.9GHz option I think) but overclocked to 5GHz

I periodically use HWinFO and Core temp just to check things out when I'm gaming or doing anything intensive. When I initially overclocked my idle temps were 29c and maxed out at 75c. A few days ago (day before the heatwave) I checked the temps and I was hitting 78c in GTA V online. So I did a stress test with prime 95 and had HWinfo open my CPU is getting into low 90s but gaming high 70s. idle temps are now 33c I dont think my cooler is failing (fractal s360) Any ideas?

Specs

Fractal R6 case
Maximus hero x
3000MHz corsair dominator 32GB
8700k (delidded) @5GHZ
fractal s36 AIO
Gigabyte aorus 1080Ti
2x SSD
NVMe drive
platter drive

Thanks

greenbrucelee · 28 Jul 2019 at 23:13

Finners said:
Just to check from new your temps have changed

Idle 29 to 33
Load 75 to 78

Is that right? If so that's completely within the realms of variance depending on what the ambient temps were when you first built it and just a bit of dust build up on your radiator.

One core just hit 80c on GTA V online also that same core is getting into the 90s when stress tested. It was never like that before. The highest temp I ever got under stress testing was 78 which is what its hitting under normal gaming and I cleaned out the cooler just to see if it helped

greenbrucelee · 28 Jul 2019 at 23:30

Also to add when using the selector on my cooler to go from pwm to auto to see if it made any difference I noticed a slight movement in my cooler and had to tighten one corner to the same as the other three screws I'm not sure how its became slightly slack but could this have caused anything should I have taken the cooler off and reapplied paste?

greenbrucelee · 28 Jul 2019 at 23:39

Space Monkey said:
Correct me if I'm wrong but aren't the ambient temperatures at the moment a lot higher, thus your CPU temps would increase by approx the same amount?

So if it's 5° hotter then your CPU will be that much higher?

yes I accept that ambient temps are higher at the moment, maybe I'm not explaining myself right. My main concern is that the one core thats hitting in to he 90s when it never did that before that core never went past 78c when stressed

greenbrucelee · 28 Jul 2019 at 23:49

Space Monkey said:
Ah right, so that's the real problem then? As your other temps seem fine

Personally, I'd take the cooler off the CPU, clean them both up, re-paste and re-seat the cooler, then go from there

yeah I think I will. MY CPU core temps when at full stress are mid 70s to mid 80s apart from core 5 which is in the 90s

Can a dellid go wrong?

greenbrucelee · 28 Jul 2019 at 23:55

Space Monkey said:
It shouldn't do though IIRC there was some talk that the liquid metal may need re-applying after a period of time, best have a Google on that one

Thanks I will do. With the cooler I used the paste that was preapplied where as in the past I have always used NHT-1. Probably the paste on the cooler isn't that good either.

greenbrucelee · 29 Jul 2019 at 00:03

Space Monkey said:
Yeah, I only use Thermal Grizzly stuff now, much better temp transfer capability, OCUK sell it

I'll need to get some isopropyl alcohol or arti clean too. I'll have to wait till I get paid on friday but will monitor rhw temps to se if anything changes. I just hope I dont have to remount the back plate becase it was an absolute **** to fit

greenbrucelee · 29 Jul 2019 at 00:08

Space Monkey said:
I bought some pure 99.99% IPA on the bay for a decent price, lasts for ages

cool thanks for your help

greenbrucelee · 1 Aug 2019 at 11:04

Space Monkey said:
I bought some pure 99.99% IPA on the bay for a decent price, lasts for ages

I just put some thermal grizzly on and I'm now getting idle 25-28c but thats at stock as I reset back to defaults. I'll give it a few hours before I overclock again

greenbrucelee · 2 Aug 2019 at 01:13

nope still getting way too hot. idle temps are great, cinebench i get 86 on the hot core, prime fft 1344 gets to mid 90s on the hot core

greenbrucelee · 2 Aug 2019 at 01:46

Space Monkey said:
Under warranty, contact OCUK, if not then next logical step would be to crack it open and see if the liquid metal is ok?

I think it may be just under warranty I'll contact OCUK see what they say

greenbrucelee · 2 Aug 2019 at 09:25

Space Monkey said:
Under warranty, contact OCUK, if not then next logical step would be to crack it open and see if the liquid metal is ok?

overclockeers have said they will take the chip back to check and reapply sillicone even though its out of warranty which is great.

greenbrucelee · 2 Aug 2019 at 16:15

an0nym0us said:
Hope they'll reapply liquid metal too.

Hopefully will ask

doyll said:
I know it's a long shot, but is it possible the case vents/filters/fans are dirty? This will restrict airflow to cooler meaning warmer air into cooler .. and every degree warmer air is going into cooler is same number of degrees hotter CPU will be.

What case and case fans do you have .. and what is fan temp to speed curve?

First thing I did was clean any dust out. Case is fractal r6 with the fans that come in it with fractal s36 cooler. Fan curve if I remember correctly (am in town at the moment) is 34c 50% minimum 60c 58 middle and 75c 100% stupid Asus don't let you go past 75c on anything else than 100%

greenbrucelee · 2 Aug 2019 at 17:20

doyll said:
Should be plenty of airflow unless exhaust venting is not more area than radiator. Maybe remove PCIe back slot covers to increase rear venting around GPU and thus improve airflow in that area and hopefully give lower temps, another long shot but might help

Edit:
Could try with case front open and see it that gives you lower temps. R6 has quite limited front vent area and opening it on older cases definitely helps, especially if fans are close to there resistance rating (mm H20).

Yeah tried that, it didn't help. Back of the pc is about 12 inches from the wall. Just to add I live in a listed sandstone house with no central heat and single pain windows as we are not allowed double glazing or even secondary glazing so it's not a warm house. Although the ***** at English trust lest us out a satellite dish on the house.

greenbrucelee · 2 Aug 2019 at 20:21

an0nym0us said:
Hope they'll reapply liquid metal too.

on the RMA it says please delidd and reapply liquid so I'm guessing that means the liquid metal and silicone will be re-done

greenbrucelee · 3 Aug 2019 at 00:09

since I've never had a system without a cpu in it (as I will whilst I'm waiting for my cpu to come back) is it best to have the retention bracket closed or does it not matter

greenbrucelee · 3 Aug 2019 at 00:56

an0nym0us said:
If you have the socket cover, it's a good idea to put that on to protect the delicate socket pins. If you don't have it, then just be really careful not to let anything touch the socket pins. I would close the latch in case I wanted to move the motherboard and so don't want the latch to be flapping around.

I havent got the socket cover, Ill colse the bracket and cover the system so nothing touch anything,

greenbrucelee · 3 Aug 2019 at 01:10

an0nym0us said:
Sounds good. Also be careful if there are any loose cables in the PC, because they could also potentially snag the socket pins if you move the whole system.

everything is snug, all my cables etc behind mother board. The only thing that could possible touch them is the coolers cpu fan cable but that will be tied out of the way

greenbrucelee · 7 Aug 2019 at 17:23

an0nym0us said:
I think you're all set.

Had two emails from them. First one says CPU repaired re-delidded max temp now 80c on 120mm aio. Then second one says rma rejected no fault found. They were sent at the same time.

greenbrucelee · 8 Aug 2019 at 12:26

an0nym0us said:
That's strange. Hopefully the second email is a mistake.

Apparently the second one is slightly mis-worded. It just means it's been sent back. I gave them a phone just to see what had happened