9700k 240mm Corsair H100i V2 high temps

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So I'm looking to run my rig with an OC, which for the 9700k I SHOULD be able to run 4.9 all cores without too much pain.

Mine.. well I can blast past 80c on a 4.7 all core OC at 1.26 (LLC 6) easily.. hitting near 90 just with Prime blend (non avx version) Small FFT's it goes mental and will hit 99c before I back off. Ambient is 24.

Spec as follows.
Case - Dark Base Pro 900, with top removed to allow airflow out the top! (and side removed for this testing)
Mobo - Asus TUF 390 Gaming Pro
CPU - i7-9700k
RAM - 32gb 3200 Corsair DDR4
Cooler - Corsair H100i V2 240mm exhaust at top, with stock push fans (I have tried push/pull but little difference other than noise!)
TIM - Thermal Grizzly Conductonaut
Case Fans = 3 silent wing 140mm front/bottom for air intake, though with the side off this doesn't really make any difference.
PSU - Corsair 1000w

So Currently I'm running 4.7 all cores at 1.26v. VCCIO etc is 1.09, all the limits are maxed (4095 etc) LLC 6, MCE disabled.

I'm running the 240 cooler MAX pump speed 3000rpm, and the fans also maxed out (whilst testing) though I will use a curve once I've actually got a good OC.

So with all this setup, running Prime blend I get 85-86c. Ambient is 24.

Yes I've reseated the cooler mulitple times.. like 10+ times.. tried shaking the cooler in case it was an air pocket, used rubber washers behind the CPU bracket as some reports say the motherboard is thinner than others which may result in less pressure on CPU. The screw mounts are down as far as they can go and the CPU IHS is level as it passes the spin test. I've tried thermal pads (carbon sheet stuff) and all different TIMs, the pump is certainly running (Link Software shows 3000rpm at performance setting) and the radiator gets real hot on the inlet, but it just doesn't seem to cool the CPU. This is my 2nd H100i V2 and I'm really not impressed by it at all. (first one I returned as the pump was noisy)

I was going to call it a day and fork out for the Corsair H150i, but it's nearly £180 atm and for that price I was thinking of kicking Corsair and going for a NZXT model. All my previous AIO's have been Corsair and I was super happy with them, until this one.

Its super frustrating to see so many reviewers with 5ghz all cores at 1.35~v with temps of 85 max on the same cooler, when I can't seem to get anywhere close even at 4.7

I know a 360mm rad should be better at cooling this CPU, but I did figure a 240 would do better than this.
Am I expecting too much from this 240?
Would a 360 make THAT much difference?
Is there anything else I could be missing? (No I'm not a fan of deliding)
Could I have a faulty AIO/RAD?

I've had this setup for around 18 months and have always had this problem. The cooling has never been great and I've kinda put up with it, until now. I think the hot summer has bought it more to my attention but I do think something is wrong somewhere.

Anyone else have a 9700k with a 240 rad I can compare with?

(Currently I had to back this off to 4.6 all core at 1.22v just to keep it below melting.
Many thanks in advance.
 
What jumps out is your LLC settlng which may be allowing more voltage through to the CPU than what you have set in BIOS and could be responsible for the higher temperatures. You may actually be better off with a slightly higher fixed voltage and a lower LLC or running a negative offset with a higher LLC.
 
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I have a 9700k running on a corsair h100 (as an exhaust, with 2x140mm fans as intake) in a fractal nano s. My idle temps are usually 30c at most, and the upper limit is around 60c on a normal load, 70c on a stress test load. When I stress test my gpu (2080ti) I still don't get a big increase in cpu temps even with the aio as an exhaust.

I have most of the bios settings on auto, but the cpu will boost to 4.7ghz quite happily and still not try to cook itself.

Have you tried removing all custom settings and running a stress test on auto to get a baseline?
 
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