Temperature almost the same after changing the termal paste

[Apollo190]

I haven't changed the thermal paste in my rog g751jy in 2 years so I did it yesterday. I also cleaned all the dust. Before doing it, while playing Battlefield 1 my gpu was constantly at 86-87 degrees celsius and throttling, while cpu was around 92-97, with clock speeds bouncing between 3GHz and 3.3GHz, also reaching 3.4GHz sometimes. Fan speeds were around 3000rpm for gpu and 3300rpm for the cpu. After I was done with the paste and cleaning, I ran Battlefield 1 again and gpu never went above 75-76 degrees and was always at full speed. CPU however, runs at 3.4GHz all the time, and then it gets to 92 degrees and drops to 2.5GHz and ~83 degrees, and then goes back to 3.4GHz until it's at 92 degrees and it's a never ending cycle. Fan speeds were 3000rpm for the gpu and 3000rpm for the cpu (300rpm less than before for cpu). Idle temperatures are 40 degrees for the gpu and 45 degrees for cpu. Is this a normal result? I'm happy with the gpu results, but underwhelmed with cpu results. It never fell to 2.5GHz before, and why are the fans running 300rpm slower? Did I do something wrong? Any way to fix this? The thermal paste I used was Thermal Grizzly Kryonaut and Arctic thermal pads for the vram and vrm (0.5mm and 1mm). I spread the paste with included spatula, as recommended by thermal grizzly. Is there maybe a curing time for the paste or something?

Here are the pictures:
Before cleaning:

GPU:

After cleaning (I cleaned the vram and vrms too but didn't take a picture):

CPU:

GPU:

New paste and thermal pads:

Thermal pads on the heatsink:

GPU:

CPU:

 

[Hairless Monkey Boy]

How do your VRM temps look? HWinfo should be able to tell you.

 

Are the thermal pads contacting correctly?

 

Did you use proper mounting pressure?

 

Did you thoroughly clean any dust out of the heatsinks?

[Radium_Angel]

30 minutes ago, Apollo190 said:

CPU

That looks like way too must paste being used.

[Apollo190]

1 hour ago, HairlessMonkeyBoy said:

How do your VRM temps look? HWinfo should be able to tell you.

 

Are the thermal pads contacting correctly?

 

Did you use proper mounting pressure?

 

Did you thoroughly clean any dust out of the heatsinks?

Unfortunately HWinfo doesn't show the VRM temps.
I'm pretty sure thermal pad contacts are good, I checked visually from the sides with a lamp, after I tightened the heatsink, and from what I could see, it looked fine.
I tightened the screws just to the point where I needed considerably more strength to go any further and I stopped there. I put the screws diagonally in an 'X' pattern.
And yes, I used alcohol, cotton swabs and microfiber cloth to clean as much as I can.

 

1 hour ago, Radium_Angel said:

That looks like way too must paste being used.

I thought so too, but I could barely spread it evenly to cover everything, as soon as I make a quick move with spatula, I can see the cpu reflection beneath, and I was told that's bad, that the cpu shouldn't be visible when you spread evenly. Also I got the sides a bit dirty when I was spreading it (maybe that's why it looks like too much), and I didn't clean it up because it was too close to the cpu and I could mess it up even more.
 

[Hairless Monkey Boy]

2 hours ago, Radium_Angel said:

That looks like way too must paste being used.

There is no such thing. Too much paste does not adversely affect performance.

[Radium_Angel]

8 minutes ago, HairlessMonkeyBoy said:

There is no such thing. Too much paste does not adversely affect performance.

https://www.gamersnexus.net/guides/3346-thermal-paste-application-benchmark-too-much-thermal-paste

 

I'm going to politely disagree with you. Can can affect thermal performance, perhaps not by much, but when you are already having issues, too much isn't helping.

[Hairless Monkey Boy]

4 minutes ago, Radium_Angel said:

https://www.gamersnexus.net/guides/3346-thermal-paste-application-benchmark-too-much-thermal-paste

 

I'm going to politely disagree with you. Can can affect thermal performance, perhaps not by much, but when you are already having issues, too much isn't helping.

You linked an article that "politely disagrees" with you... Did you even read it?

[SkilledRebuilds]

12 minutes ago, Radium_Angel said:

https://www.gamersnexus.net/guides/3346-thermal-paste-application-benchmark-too-much-thermal-paste

 

 

Conclusion: What is the Best Way to Apply Thermal Paste?

"So again, the bigger goal is to cover the IHS. Once that’s accomplished, assuming you’re using a non-insane amount of paste, like an entire tube of TG, it really doesn’t matter how big the blob is."

[Apollo190]

I tried it again on a different map and got the same results. Honestly, It was a better experience before than it is now, that huge drop from 3.4 to 2.5 GHz is really noticable in fps. Clock speeds were lower before (3.0-3.3 GHz) but at least it was consistent, there were no such huge drops.

[Radium_Angel]

16 minutes ago, HairlessMonkeyBoy said:

You linked an article that "politely disagrees" with you... Did you even read it?

I did, and while the results are minor (the final graph IIRC shows this) they do matter, exp if you are already overheating

[Radium_Angel]

12 minutes ago, SkilledRebuilds said:

non-insane amount of paste

which the OP used, as it's oozing over the sides of the CPU/GPU, and is still lumpy, so when pressure is applied, more will spill out the sides.

IMPO, too much.

 

YMMV and if so, knock yourself out, use all you want, but to me, it's too much.

[Hairless Monkey Boy]

1 minute ago, Radium_Angel said:

the final graph IIRC shows this

The final graph is a CPU cooler benchmark recap.

 

Read the article.

[Radium_Angel]

Just now, HairlessMonkeyBoy said:

The final graph is a CPU cooler benchmark recap.

 

Read the article.

This one

 

[Hairless Monkey Boy]

Just now, Radium_Angel said:

which the OP used, as it's oozing over the sides of the CPU/GPU, and is still lumpy, so when pressure is applied, more will spill out the sides.

IMPO, too much.

 

YMMV and if so, knock yourself out, use all you want, but to me, it's too much.

OP please don't listen to this non-sense. Your thermal compound application is spot on.

[Hairless Monkey Boy]

1 minute ago, Radium_Angel said:

This one

 

... It's within error. 

[Hairless Monkey Boy]

1 hour ago, Apollo190 said:

I tried it again on a different map and got the same results. Honestly, It was a better experience before than it is now, that huge drop from 3.4 to 2.5 GHz is really noticable in fps. Clock speeds were lower before (3.0-3.3 GHz) but at least it was consistent, there were no such huge drops.

That sounds like a thermal throttle, but since the CPU isn't getting as hot as it did before, that is why I suspect it is a VRM thermal issue.

 

If I were you I would disassemble the laptop again and check that the thermal pads are correctly positioned and contacting. I would check that the CPU and GPU look like they had good contact, and I would re-mount the cooler with maybe a little more pressure.

[WkdPaul]

* thread cleaned *

[Apollo190]

7 hours ago, HairlessMonkeyBoy said:

That sounds like a thermal throttle, but since the CPU isn't getting as hot as it did before, that is why I suspect it is a VRM thermal issue.

 

If I were you I would disassemble the laptop again and check that the thermal pads are correctly positioned and contacting. I would check that the CPU and GPU look like they had good contact, and I would re-mount the cooler with maybe a little more pressure.

Hmm, true, though I was still expecting much lower temps than 92 considering all the dust was cleaned and paste was changed.
I was hoping I wouldn't have to open it up again, it's a nightmare getting to the motherboard :D. 
How do I make sure the contact was good, do I look for "imprints" on the pads and spread shape on the heatsink for cpu/gpu?

[Hairless Monkey Boy]

Just now, Apollo190 said:

do I look for "imprints" on the pads and spread shape on the heatsink for cpu/gpu?

Basically, yeah.

 

You should be getting like new temps if you really cleaned all the dust out etc.

[Apollo190]

Just a quick update, during Intel XTU stress test, cpu temp. doesn't go above 82 degrees, but it keeps showing "Power limit throttling: yes".
No undervolt was applied. Also it doesn't let me any lower than -0.090 for core voltage, and I didn't notice any temperature difference at -0.045.

[Hairless Monkey Boy]

A power limit should not cause such a sudden and jarring reduction in clocks.

[Apollo190]

Alright, I disassembled it again, here are the pictures:

Before taking off heat sink:

Thermal pads:

 

CPU:

 

GPU:

 

After taking off heat sink:

 

 

GPU:

 

CPU:

 

Thermal pads that separated from the heat sink after taking it off:

 

Heat sink:

 

So, what was causing the cpu problem?

From what I can tell CPU contact was good, but maybe I'm wrong. 

[narrdarr]

CPU and GPU contact look fine. Tough to see how well all your thermal pads made contact. Some looked great others looked like they were just hanging out.

[Apollo190]

22 minutes ago, narrdarr said:

CPU and GPU contact look fine. Tough to see how well all your thermal pads made contact. Some looked great others looked like they were just hanging out.

From what I can tell, the ones circled in red had good contact, while those circled in yellow left almost no imprint: 

 

EDIT: Would it be better to place thermal pads directly on the chips instead of on the heat sink like I did last time? 

[narrdarr]

6 minutes ago, Apollo190 said:

From what I can tell, the ones circled in red had good contact, while those circled in yellow left almost no imprint: 

The ones in yellow were .5 or 1mm? Also if they are oversized and have zero contact they will insulate.