P775dm3 CPU/GPU overclock query

After flashing a custom BIOS(Dsanke) I have swapped out the stock i7-7700 for i9-9900kf. Interestingly temperatures are WAY better on the new CPU- 70-82 @ 4.3ghz with 100mv undervolt vs 90-100 @ 4ghz on the old one.
This also led to better GPU temperature and higher clocks where previously it would throttle from 1810 all the way down to 1450(with proper kryonaut repasting), now I have it pretty much locked at 1835 while being almost 10C cooler.
Trying to push the CPU/GPU any higher than this probably hits a power limit because clocks don't hold inspite of thermal headroom, but I've heard it's possible to hit 5ghz all core boost with these machines and maybe 2ghz on the GPU?
Really trying to get the maximum performance from the new CPU and GTX 1080 combo.

 

The 9900kf is going to be tricky to run 5GHz on the stock power settings. What have you changed?

 

Well, for starters bumped the PL2 to 135 and applied an undervolt of 105mv.
It's holding @4.8(although I'm guessing it can do 4.9) but cooking itself all the way up to 94c,with 95 spikes in Battlefield V after 20 minutes.
I'm not too worried about the CPU since I already had a badly binned i7-7700 last me for 3 years at up to 100c without delidding, so I guess Intel didn't lie about temperature thresholds.
My only concern is thermal paste breaking down and losing its efficacy at those high temp! It usually begins with the GPU throttling first. So far the only one I've had on my system is kryonaut.

 

Lately I've had this system run @ stock clocks with turbo disabled and about 105/150 uv on the CPU/GPU. It hovers around 59-63 during gaming & the max I've seen the CPU go is about 67. Bumping the GPU by 300 and CPU to 4.3 and temps go to about 75-87. That increases the performance by about 10-15%.
Is there any thermal paste that can keep up with 99c temps? I'm guessing that adds another 10% to performance, if the cooling can keep up.

 

Also the GPU seems to be running into power limits at about 1V. It starts off at 2ghz but stabilizes at 1835, any idea why? It's 5c short of throttling(83-85).

 

If you're from India, IC Diamond or Cooler Master Maker Gel are best bet since Phobya Nano grease or Kingpin are hard to get and are expensive.

 

Delid and liquid metal and a taller IHS are probably going to be needed to get temps down.

 

Won't a taller IHS cause tolerance issues?

 

There’s a gap between the CPU and heatsink, that’s why the taller IHS helps.

 

I assume you're talking about the copper one from rockitcool? I have a delid kit lying around but have no experience with 9th gen delidding, although I've heard people say it's not worth it because the stim does a better job than the old paste on the 7th/8th gen

 

Nope, the Rockitcool IHS is the same height as the stock IHS. I have the BartX Clevo IHS which is 1mm taller.

 

This?
https://bartxstore.com/shop/intel-9xxx-series-copper-ihs-nickel-plated/
Interesting, and what is your temperature like?

 

Nope, this one. I have an i7-8086K.

https://bartxstore.com/shop/intel-8xxx-series-custom-copper-ihs-for-clevo-notebook/

https://bartxstore.com/shop/clevo-custom-copper-ihs/

Dunno about temperatures, been busy so I haven’t installed the IHS or the 8086K yet.

 

Yup, my bad. I just sent them a query for 9th gen nickel plated IHS for clevo. Interesting to see if there's a temperature drop really.

 

It's all about getting those last few C to give yourself some headroom.

 

Haven't seen that Bart made this IHS into an entire SKU for itself, aimed at Clevo owners. Very neat!
Makes me smile that what started out as a little hobby project, chasing lower temps, gained enough traction on here from word of mouth to him making it a part of his store.

 

Here was me dremmeling a ye ancient one. Might get that just to have a smoother finish.

 

If anything, the BartX IHS is too smooth. I had to roughen up the top face of it with sandpaper so that LM would actually stick to it.

 

Yes, for a copper IHS you want to do this with a quick 2500+ grain scuffing, while if it's nickel plated you want to leave it be as is.

 

Mine is nickel plated and the bit I modified was dremmeled so I did not have issues spreading it!

 

Installed my i7-8086K and BartX IHS this weekend. Running 4.9GHz with a -120mV undervolt on core/cache, it hovers in the low to
high 70’s at between 115-120W in TS Bench 6144M (11 minute long test):



This is with Conductonaut on all surfaces and max fans. I also upgraded the stock fans (13 blades) to the 9th gen 17 blade fans. Not sure if the new fans are lower RPM, but they are way quieter, or at least have a far less annoying pitch.

 

1.21 VID, not terrible for 4.9Ghz.