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.

[hmscott]

Darnassus wrote:
GPU Tweak 2.0.0 something. Very early edition.

It's the one that came stock on my unit, and I found it again.. honestly not sure WHY it needed updates.. can't figure out what'd need to be fixed on a simple OC program. Doesn't crash, reads my temps and everything properly.. thankfully I found it.


Yeah I had put on way too much I must admit. The CPU and GPU right now are sitting on 66 / 67 max on constant gameplay now that the ambient temps around here have dropped down to a nice 32*C.

I think I did a good, proper paste this time.. though maybe my application again was too thick, I did a spread, though I made sure I couldn't see the die, maybe I need to start using a card like you say, I'll find a dummy one somewhere and try it out for myself.

I keep forgetting that thermal paste is supposed to fill cavities and gaps, not actually make a 'bridge' between the two surfaces. I just worry what'll happen if I don't have enough..

Maybe doing the card method on both sides, on the die and the sink plate?

Darnassus, that's it, fill the gaps and imperfections on both surfaces and use a straight edge to drag over the surface to level the ever thinning coverage - minimal is best - that is enough. It takes practice to get it right 🙂

[Wulff]

ok the guy from asus parts got back t me about wich thermal pad would be the right one for the g750, it's this one:
http://www.asusparts.eu/en/Asus-13GNX010T010-1

he even included a pic of it, and by the looks of it it looks like you have to break it into pieces and place those at the chips? does that mean this stuff is only to be used at those ram chips etc and on the gpu itself normal thermal paste would be needed perhaps?

pic:

[hmscott]

Wulff wrote:
ok the guy from asus parts got back t me about wich thermal pad would be the right one for the g750, it's this one:
http://www.asusparts.eu/en/Asus-13GNX010T010-1

he even included a pic of it, and by the looks of it it looks like you have to break it into pieces and place those at the chips? does that mean this stuff is only to be used at those ram chips etc and on the gpu itself normal thermal paste would be needed perhaps?

pic:

Wulff, I would need to see the other side to be sure, but generally these things are all done in 1 piece to pull off the paper on one side covering the paste/pad with gaps between the pads to match the physical layout of the cans it is being applied to. To make you separate the whole into little piecess to try to apply individually - that defeats the whole idea 🙂

I thought there were 2 sets of pads for each G750?

[Darnassus]

hmscott what're the best thickest paste you know of? I'm considering doing another test.

Again, the G750's GPU is all paste, not pad. Open yours up if you want to check yourself.

Here's some images too, when the sink was first pulled off.


http://www.imagebam.com/image/f20974267647082

http://www.imagebam.com/image/da9b0e267647111

http://www.imagebam.com/image/8efb1a267647150


If the manufacturer used paste instead of pads on the sink, then I think we should be using paste, too.. but a highly thick 'viscous' paste.



I've been looking at K5-PRO gummy thermal paste.

[Darnassus]

Woooooooow...

Seems this is what Asus uses to bridge the VRM's to the board.

http://www.bergquistcompany.com/thermal_materials/gap_filler/gap-filler-1000.htm


It's not a thermal paste, OR a thermal pad, it's exclusively called 'thermal gap filler'

[hmscott]

Darnassus, there are lots of newer pastes/TIM's that have come out, but I still stick with AS5, MX-2/4, and NT-H1 because I have bunch of tubes left over that are still fresh 🙂

So I haven't tried the newer thinner/thicker TIM's (Thermal Interface Material), but there are lots of reviews, I would check them out and try a few, they aren't that expensive.

As I recall the last time I looked the AS5, MX-2/4, NT-H1 pastes were still good enough, and my guess is it really comes down to application thinness / adequacy in the end. I read a lot of bad reviews of NT-H1, but also read some good ones. My temps with NT-H1 were within 1 degree of previous AS5 results.

For the G750/G751, it comes down to figuring out of the part/heatsink are flush against each other, and then selecting the TIM with the correct thickness/thinness to have the best effect. Having 2 choices or more on hand makes that easier.

There used to be a trick to use to find the points that touch and don't touch, but you might need to go out and buy a sheet of it these days, most people have thrown away their typewriter carbon sheets. Place the carbon sheet carbon up and lay it out over the area to be covered with the heatsink, then press/wiggle the heatsink gingerly so as to transfer some of the carbon to the high/touch points on the heatsink.

Maybe you can come up with another method - a thin coating of some colored non-conductive liquid that will transfer to the heatsink plate when pressed against the components.

If I come across a good TIM review(s) I will add them here.

I look forward to your results and materials used 🙂

[Darnassus]

What's a good, thick paste that comes in ample supply for VRM's now then? Sort of like K5, ( it feels like cement paste / chewing gum )

I'm still on MX4 myself.. can't find any reputable source for good, new pastes.

[hmscott]

Darnassus wrote:
What's a good, thick paste that comes in ample supply for VRM's now then? Sort of like K5, ( it feels like cement paste / chewing gum )

I'm still on MX4 myself.. can't find any reputable source for good, new pastes.

Darnassus, K5 seems to be a boutique product, and only available on ebay... their website doesn't even come up when searching google:

http://www.computer-systems.gr/

K4-Pro (English)
https://translate.googleusercontent.com/translate_c?act=url&depth=1&hl=en&ie=UTF8&prev=_t&rurl=trans...

K5-Pro (English)
https://translate.googleusercontent.com/translate_c?act=url&depth=1&hl=en&ie=UTF8&prev=_t&rurl=trans...

For cooling products www.frozencpu.com is good, but they don't carry K5:
http://www.frozencpu.com/cat/l1/g8/Thermal_Interface.html

Going the other direction, I went to the AS5 site and looked at their Where to Buy pages, and found these sites listed for Australia that might be worth checking out. You could do the same with other known cooling products, and find distributors locally, or from the US if you prefer.

AS5 International Resellers
http://www.arcticsilver.com/international_resellers.htm

Some Australian resellers (None have K5-Pro):

http://www.auspcmarket.com.au/
http://www.auspcmarket.com.au/cpu-cooling/ <== Cooling

http://www.computeronline.com.au/
http://www.computeronline.com.au/products_pic.php?C_ID=28 <== Cooling

http://www.jpcomputersolutions.com.au/
http://www.jpcomputersolutions.com.au/liquid-cooling/thermal-compounds <== TIM's

http://www.techbuy.com.au/
http://www.techbuy.com.au/searchcat/COOLING_THERMAL_COMPOUNDS.asp <== TIM's

Let us know what you find 🙂

[us18x]

Thinking to re-paste my JX too wondering what paste should I order for that... I pasted all my old G models but not this one "yet" using AS5, willing to try something new though... any suggestions? is TIM better than AS5?

[Darnassus]

Did my repaste, currently using K5 Pro on all chips in the GPU interface, except the die.

HMSCOTT!! ;D I used a guitar pick to spread my MX-4! It worked wonders, it got really, really nicely thin and even, too! I didn't use a credit card because the edges seemed a little too rough and also too big but a guitar pick really did the trick.

The MX-4 on the VRams dried out, on the metal ones anyhow (cans?) so I think the K5 might prove more worthy. We'll see soon in the next 3 months.

The K5 I must admit was a real b!tch to spread.. and I mean it, it's viscosity is like macho cinder putty for the burly builder laying down a wall to stop a tank. Almost like.. near dry chewing gum.

So far temps idle are 45*C on the CPU and 38*C on the GPU. CPU idle higher I assume with all the programs I have on startup.

Running WoW currently. Temps dropped down 8-10*C prior to repaste. I'm happy again. ;d Hope it lasts through the summer.


Edit: All temps staying under 70*C full bore. Ambiance is around 30*C