P775 TM1G question about purchasing a heatsink from aliexpress

[MiRaGe]

Unfortunately this heatsink turned to be a great disappointment for me. It was hardly better than the original one on the GPU side, the CPU was around 7-10C better but still reached 100C occasionally…

the worst part is that the GPU hotspot reaches the absurdly high 96-98C.

also it doesn’t make a good contact with the VRam on the right side…

I am going to use the original one with new thermal pads and liquid metal on both GPU and CPU side.

[zex4]

I can confirm the temps for cpu side but on gpu i had around 10-18 better temps also the the Hotspot was better cooled when i had this heatsink time ago...with thermal grizzly kryonaut....

[MiRaGe]

What was your gpu? 

[zex4]

Back then I had a gtx 1080 with 200w tdp....I selled the heatsink (after that the gpu aswell) because of the cpu temps 😓

Also the cpu was i7 8700k...that was faulty later with strange artifacts...

[the jg89]

On 3/3/2023 at 12:26 PM, MiRaGe said:

Unfortunately this heatsink turned to be a great disappointment for me. It was hardly better than the original one on the GPU side, the CPU was around 7-10C better but still reached 100C occasionally…

the worst part is that the GPU hotspot reaches the absurdly high 96-98C.

also it doesn’t make a good contact with the VRam on the right side…

I am going to use the original one with new thermal pads and liquid metal on both GPU and CPU side.

What thermal pads did you use? any copper ones?

[MiRaGe]

I re-padded with some softer 12.8 w/mk and it is better than before, but comparing with the stock heatsink - only 2-3C on the GPU side and 5-6C on the CPU side. Definitely it’s not worthing 200€.  I still do think I'll get better results with stock heatsink + liquid metal (LM works awfuly on the modded heatsink, I tried it)

 

[the jg89]

11 hours ago, MiRaGe said:

I re-padded with some softer 12.8 w/mk and it is better than before, but comparing with the stock heatsink - only 2-3C on the GPU side and 5-6C on the CPU side. Definitely it’s not worthing 200€.  I still do think I'll get better results with stock heatsink + liquid metal (LM works awfuly on the modded heatsink, I tried it)

 

what's the max temp on each? lower than 70 - 80 ish?

[MiRaGe]

5 hours ago, the jg89 said:

what's the max temp on each? lower than 70 - 80 ish?

CPU is impossible to get cooled bellow 99-100C under 100% load at 4.7GHz. But it holds longer at full speed without throttling. At 4.4GHz it was 99-100 after hour of gaming, now it is 92-93.
RTX 2080 200W (160/800OC) hits 77-79C when CPU is at 4.7Ghz full speed. (before was 85-87C)

When CPU is at 4.4Ghz, the GPU max out at 75C. If no O/C is applied and the default 150W vBios is used, I suppose it won’t heat up above 63-65C.

This laptop starves for Liquid Metal. 
I am really interested in what your result is going to be!

[MiRaGe]

On 3/5/2023 at 11:19 AM, the jg89 said:

what's the max temp on each? lower than 70 - 80 ish?

When are you going to test yours and share the results?

[the jg89]

6 hours ago, MiRaGe said:

When are you going to test yours and share the results?

I'll need to wait a bit since the thermal pads haven't arrived yet.

[the jg89]

I know this is dumb to ask but is it possible to place thermal pads on motherboards? They are non conductive so I figure it's one way dissipate heat especially since the cpu side has a chunk of free space for that.

[MiRaGe]

No, absolutely no point in doing this. It will only result in heating the motherboard unnecessarily up.

The point is the CPU’s heat to be transferred outside the chassis not inside.

[1610ftw]

On 3/5/2023 at 11:49 AM, MiRaGe said:

CPU is impossible to get cooled bellow 99-100C under 100% load at 4.7GHz. But it holds longer at full speed without throttling. At 4.4GHz it was 99-100 after hour of gaming, now it is 92-93.
RTX 2080 200W (160/800OC) hits 77-79C when CPU is at 4.7Ghz full speed. (before was 85-87C)

When CPU is at 4.4Ghz, the GPU max out at 75C. If no O/C is applied and the default 150W vBios is used, I suppose it won’t heat up above 63-65C.

This laptop starves for Liquid Metal. 
I am really interested in what your result is going to be!

 

I think that the heat sink still isn't big enough to dissipate even more heat, it just isn't that much metal there to make a big difference when both CPU and GPU are running.

It would be interesting to know how high you can go with only the CPU running something like CB R23 multi core as it is very well possible that this design lends itself well to CPU heavy loads with little GPU involvement.

 

 For more improvements in heavy gaming I would probably go for the water cooled version as that should run a lot cooler and most important more quiet but at least right now that isn't very tempting considering price and complexity of such a solution.

 

[MiRaGe]

5 hours ago, 1610ftw said:

 

I think that the heat sink still isn't big enough to dissipate even more heat, it just isn't that much metal there to make a big difference when both CPU and GPU are running.

It would be interesting to know how high you can go with only the CPU running something like CB R23 multi core as it is very well possible that this design lends itself well to CPU heavy loads with little GPU involvement.

 

 For more improvements in heavy gaming I would probably go for the water cooled version as that should run a lot cooler and most important more quiet but at least right now that isn't very tempting considering price and complexity of such a solution.

 

 

After 8 Min multi-core 

With cooling pad and 2x80mm fans. Modded undercover:

 

[MiRaGe]

[1610ftw]

93 degree does not look too bad - how many watts can it sustain in the end?

I just checked a P775 that I have here at the moment and it can do about 110W and 96°C with a 10 minute run, no cooling pad or bottom cover modifications.

That is with the separate heat sinks for GPU and CPU.

[the jg89]

On 3/9/2023 at 10:32 PM, MiRaGe said:

quick question what thickness did you use for the cpu side of the board?

 

just applied my heatsink and for some reason the cpu side is hotter than usual, just thinking that thepad thickness might be different for this heatsink

[MiRaGe]

I used the standard pads - 4mm and 2mm.

What does it look on your side?

[the jg89]

16 minutes ago, MiRaGe said:

I used the standard pads - 4mm and 2mm.

What does it look on your side?

The green is 3mm and the purple is 4mm

 

starting to think the original heatsink was better ^_^'

[MiRaGe]

The green should be 2mm

At least I measured and used 2mm.

 

[the jg89]

2 hours ago, MiRaGe said:

The green should be 2mm

At least I measured and used 2mm.

 

Barely did anything, just swapped back to the old heatsink now(seemed to yield better results 😞

do you think it's because the underside isn't copper coloured cause I noticed that with my original heatsink

[MiRaGe]

Tell me what exactly is the temp difference between the two HS for both GPU and CPU?

I managed to make mine work better than original one.

[the jg89]

7 minutes ago, MiRaGe said:

Tell me what exactly is the temp difference between the two HS for both GPU and CPU?

I managed to make it work better than original one.

The new heatsink normally went into the 80s then the normal one

I used 12.8 k thermal pads from thermal oddesey and arctic mx 6 thermal paste, even used your advice on thermal pad placement but still the cpu was hotter than gpu side, gpu stuck close to the 60s - 70s.

[MiRaGe]

80s is pretty normal for 9900K. How was it before with the original HS?

[the jg89]

4 minutes ago, MiRaGe said:

80s is pretty normal for 9900K. How was it before with the original HS?

I guess roughly the same, did you undervolt by any chance? I've been wanting to try that but don't want something bad to happen

 

I figure I leave it alone for now and maybe try later.