Repasted G750JX, shocking result.

[Darnassus]

I just recently did a repaste on my G750 and it turns out my temps lowered down by a staggering 10-15*C BOTH on CPU and GPU

My past temps were 83 max record on the CPU and 82 on the GPU

EACH TEST WAS DONE FRESH AFTER REBOOT -- TEMPS RECORDED WITH CPUID HWMonitor

CPU used handbrake bench, before 83*C, after 71*C

GPU used Furmark (Burn In 15min 1920x1080) before 82*C, after 68*C


The process took me 6 hours, ( of course I will be careful ) but when I pulled off the GPU heat sink, there was crap EVERYWHERE.. all over the board, even under the plastic protectors of the chips.


They use this sort of weird.. "paste" looks like it's some blue-tack like strip you just put down, unless it's machine applied.. it looks extremely formal. It was practically dry in my understanding.. after 9 months use on low-end games ( I play stuff like Warcraft 3 mostly with my friends, and high-end games on the side, temps never exceeded 65-70 on the GPU Tweak report )

I was literally scraping off the old stuff with a paste spreader, it looked like a cracked wall, and crumbled like plaster.



Replaced with Arctic MX-4 (I didn't use silver, though I could have for the main chips on the die, but everything else was quite small and difficult not to make a mess, I didn't want to risk getting it onto the board.)

It looked like this when I first removed it
http://www.imagebam.com/image/da9b0e267647111

How it looks when applied during assembly?
http://rog.asus.com/wp-content/uploads/2013/08/GTX780M-heatsink-1.jpg


What ever that paste is that came stock, it's simply terrible.. 10*C I understand is quite the improvement. Also got a chance to clean out my fans which was nice.

[Darnassus]

[http://imgur.com/1FjJSB6,fVQ4cVT

Here is how it looked when I pulled it off. I had a strong idea that everything was touching quite close..

There's TWO images in there by the way.

Edit: You know, looking at it, some of the chips weren't even properly covered.

[hmscott]

Darnassus wrote:
http://imgur.com/CAr8sG4,qCfkXPD

Here is how it looked when I pulled it off. I had a strong idea that everything was touching quite close..

There's TWO images in there by the way.

Darnassus, I know you didn't have enough paste left to redo it, but if you did, what I do is to do a test placement first, then pull it off and see how the paste spread on the can / heatsink to see if it is spreading well/enough. If you had done that you might have seen if the blob of paste you put on each can was compressed and spread - or the peak was just topped and not spread.

You could order some more MX-4, and pull the plate to see how it spread, and redo it or add some more if needed. Some times I do 5 dots, 1 in the center and 1 near each corner to see if they meet after mounting and screwing down the heat sink - at least the first time I do it with a new heatsink / CPU mating.

[Darnassus]

hmscott wrote:
Darnassus, I know you didn't have enough paste left to redo it, but if you did, what I do is to do a test placement first, then pull it off and see how the paste spread on the can / heatsink to see if it is spreading well/enough. If you had done that you might have seen if the blob of paste you put on each can was compressed and spread - or the peak was just topped and not spread.

You could order some more MX-4, and pull the plate to see how it spread, and redo it or add some more if needed. Some times I do 5 dots, 1 in the center and 1 near each corner to see if they meet after mounting and screwing down the heat sink - at least the first time I do it with a new heatsink / CPU mating.

Oh I did, I pulled it off to check if all were making contact, and they did. I'm just nervous that the paste isn't sticky / thick enough now.

I mean, the paste was really stringy and like a proper goo.. it wasn't thin and seemed to have a slight memory when trying to spread it.

Do you know a program that'll let me watch my VRM temps.. or..

What was the program you said I should use to test if I see artifacts?

[hmscott]

Darnassus wrote:
Oh I did, I pulled it off to check if all were making contact, and they did. I'm just nervous that the paste isn't sticky / thick enough now.

I mean, the paste was really stringy and like a proper goo.. it wasn't thin and seemed to have a slight memory when trying to spread it.

Darnassus, without measuring the gap to each can, and knowing the previous viscosity / thickness of goop, it's hard to tell if there is enough of a gap that you need thermal pads, or extra thick paste.

I am starting to think it is ok. Given the photo and raised plate areas. And, that you did pull the plate and look at the spread already - that is reassuring.

Time and meory OC / stress testing will tell 🙂

[Darnassus]

If my VRM's overheat, my GPU will turn off and tell me something, right?

What is the outcome if I've failed? There IS a failsafe, right?

At least my CPU went well..

Also I remember looking at the side, and seeing the big chips at the far side were smooshed right up against the plate when I screwed it down. (Where the ASUS brand tag is)

[hmscott]

Darnassus wrote:
If my VRM's overheat, my GPU will turn off and tell me something, right?

What is the outcome if I've failed? There IS a failsafe, right?

At least my CPU went well..

Also I remember looking at the side, and seeing the big chips at the far side were smooshed right up against the plate when I screwed it down. (Where the ASUS brand tag is)

Darnassus, it sounds like it all went well, it might all be ok, I just wanted to point out the gap issue for the cans around the GPU. They might all be ok - it sounds like you are remembering checking the fit to the top of the cans during assembly, and you likely would have seen gaps on them when viewing on edge like you did with the ones around the edge.

IDK about fail safe for VRM's, or memory, but the GPU would shut down / down clock if overheating. IDK about the rest of the support components.

Asking Asus via a Technical Inquiry might be the best idea.

[hmscott]

Darnassus, you can also ask Asus directly via a Technical Inquiry, explain the JX repasting you did, and ask if it needs a gap filler like a thermal pad or extra thick paste for the memory cans around the GPU to meet the plate correctly.

[Darnassus]

God damn you Scott you nearly gave me a heart attack..

[hmscott]

Darnassus wrote:
God damn you Scott you nearly gave me a heart attack..

Darnassus, too bad the website was down, we could have discussed ahead of time 🙂

Didn't we go through this a few months ago? I seem to remember posting a reply with info on thermal pads...

Even if there is a gap, right now it is likely ok with the current pasting, but it is something to check out - if you ask Asus please post their reply.

[Darnassus]

Idle Temps are down by 7*C