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Dreamonic
06-19-2013, 08:10 PM
When I modified my 660M vBIOS with a voltage of 1.25v and fixed the thermal voltage drop, temperatures were becoming a problem. So I thought it would be good to do a repaste on both GPU and CPU. I went with MX-4 and where the thermal pads were (what was left of them) I spot applied paste in replace; I had surface contact on my heat sink, verified.

Before my temps on the GPU were maxing at 89-92+C and CPU mid 80's. After the repaste the GPU is maxing at 77C and CPU at 67C; The stock paste was literally clay like and crumbled during removal.

It's been a couple weeks since and everything is running cool still but I wasn't yet completely satisfied. In the past I've always done mods to my laptops, particularly the intake mod. I really dislike cooling pads because it's one more thing you have to keep carrying around if you plan on doing any sort of gaming on location.

So this is what I did:

I used a 2 1/8" hole saw (2" if you plan on no o-rings) so that I could utilize the grilles on the inside (flush outside) and secured it with Permatex Ultra Bond (gel type) which then gets covered via rubber o-rings that are cut and glued to appropriate size over the grilles. I centered the holes directly in the middle of the fans.

The tedious parts were the cutting of the grille holders on the backside of the plates (2 per plate that holds in the grilles) you have to avoid cutting off the tabs that hold the plates in place while cutting everything flush to the panel surface. Other than that, pretty self explanatory.

Results? Another 3-5 degrees drop in overall temperatures and temps drop at a much quicker rate than before. So with the repaste and this mod I got roughly a 14 degree drop overall.

Next I'll be painting the fan shrouds black to hide them and painting the fan bearing covers silver.

LINK (http://voltground.com/haven/threads/9/)

gokica
06-19-2013, 08:50 PM
Always a pleasure reading your posts. This is one hell of a mod.

Great work! Thanks for sharing.

13fist
06-19-2013, 09:46 PM
Very well done! I've been planning that mod myself I just have not gotten too it yet. It should, hopefully, reduce the amount of dust getting sucked into all the ports. I was going to do mine just a bit different and put foam weather stripping around the holes to seal against the fans to sort of duct the outside air straight in. With a 14c drop, that might not even be necessary.

Dreamonic
06-20-2013, 03:07 AM
Thanks. I suggest if you do plan on going this route to make sure you secure the grilles not only from the bottom, but the top side as well. The reason being, is when you do need to remove the bottom panels, the flexing from them won't break the bond around the grilles since they are nearly at the edge. I also used 2-in-1 auto touch up paint to coat over the glue once it hardened to give it extra strength from breaking when flexed.

It's rock solid.


Looking forward to seeing how yours turns out. The intake shroud with the foam weather stripping is not a bad idea. I'm curious how well the rest of the components will cool as the air being pulled inside the chassis now won't be nearly as strong (low vacuum.) Next, I may do a copper mod of some kind, only time will tell.

ggBanks
06-20-2013, 09:42 AM
Dude that's wicked! I tried similar thing on my G55 before. It wasn't the same, as I just used 1mil drill bit to drill around 100 holes in a square shape right below my GPU and CPU. That was until I got my laptop bricked by the stupid BIOS update, so I had to send it for a repair. Since I have performed such an extravagant mod and I was sure the warranty was void I was expecting a price tag around at least $400 for replacing the mobo, but then miracle happened and they returned the laptop to me repaired with new mobo free of charge :D

The only drawback of this is that they had replaced the whole chassis too, so no holes for me now :D Although if I look at it from financial point of view I am so grateful for that.

I thought of doing that again, but not any time soon, and now that I saw your mod, I think I will order some G75 grills from eBay, and mod my G55 with them like you did :)

And since I commented on the topic, now I can follow it WOOHOOO :D

Tomislav
06-20-2013, 10:43 AM
Awesome.I like this a lot, maybe I'll do something similar in the future.

Apexing
06-20-2013, 05:06 PM
Thats a good looking mod too :)
And if people are replacing the TIM anyway, might aswell do this mod too.

13fist
06-21-2013, 06:40 PM
Hang on. I just caught it that you didn't need thermal pads to get contact when you re-pasted everything? That is good news. No one has ever verified this before.

TokoDude
06-21-2013, 08:12 PM
Nice nice! congratulations on your good work!

Dreamonic
06-21-2013, 09:06 PM
Hang on. I just caught it that you didn't need thermal pads to get contact when you re-pasted everything? That is good news. No one has ever verified this before.

That is correct. When I lifted my heat sink off, everything but the GPU was GOOP and the paste on the GPU was clay. On the backside, the thermal pads still appeared to be in like new condition (there wasn't any glossy surface to them from extreme thermal cycling) so I left those alone and only repasted the topside.

I did however look at the card on it's side so I could get a better look at how close of contact the sink gets all around. There is little to no gap. The distance with spot applied paste looked exactly the same as with factory thermal pads (if you can even call them that.)

I'm 140mV over stock voltage with a max overclock for my 660M, so if heat transfer wasn't adequate in the areas where paste was used in replace of pads, I would have had tell tale signs about it, especially with the mosfets, vrm and vrams. However, I know it made proper contact ;)


Happy modding!

Apexing
06-22-2013, 10:01 AM
Dreamonic, if I wanted to use thermal-pads the same places the original ones were, what thickness would you recommend ?

ggBanks
06-22-2013, 10:34 AM
Do the VRAM chips need cooling at all? I mean they are not cooled separately from the GPU die, but are connected to the same plate that touches the die, that means that whatever temp the GPU has the chips will have the same, because they are pretty close to the die. I don't even think you need neither pads nor paste. Its the same with RAM, it is not cooled, although it runs 2.5 times slower than the VRAM, I don't think that the VRAM will become so hot that it will melt the chips. If the GPU is 80 degres then the chips will be 80 degrees too, but I think that if there is no paste or pads it will run even cooler with the clocks that it has already. What's your take on this?

Apexing
06-22-2013, 02:42 PM
Not sure banks.
Ive ordered some of these therm http://www.ebay.co.uk/itm/271169571905?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649 it has a very high Thermal Conductivity: of 14 W/mK, and its within EU so I woont have to pay taxes for it. And then ordered some phobya Hegrease extream thermal compound. So once it all arrive, ill have to set some hours away so I can take the laptop apart :)

Dreamonic
06-22-2013, 02:47 PM
Dreamonic, if I wanted to use thermal-pads the same places the original ones were, what thickness would you recommend ?

1mm is the magic number.


Do the VRAM chips need cooling at all? I mean they are not cooled separately from the GPU die, but are connected to the same plate that touches the die, that means that whatever temp the GPU has the chips will have the same, because they are pretty close to the die. I don't even think you need neither pads nor paste. Its the same with RAM, it is not cooled, although it runs 2.5 times slower than the VRAM, I don't think that the VRAM will become so hot that it will melt the chips. If the GPU is 80 degres then the chips will be 80 degrees too, but I think that if there is no paste or pads it will run even cooler with the clocks that it has already. What's your take on this?

System memory is not running at the same frequencies as (GDDR5) VRAM. RAM is much slower in comparison and is isolated, even so people will still use heat spreaders when OCing them as heat causes instability.

What is the major concern is the core, VRM and mosfets cooling. The VRAM is as equally important as the chips lifespan will be reduced if no form of cooling is used at all. Most reference video cards factory cooling setups have air blowing on them as well as their VRM's and mosfets which can usually handle upwards of 100C but will burn out if temperatures hover in this area for any great deal of time.

GPU core temperatures will always be higher than VRAM, but not as high as VRM.

It will not run cooler without pads or paste, as there is not the same amount of air flow like with reference video cards. Our heat sinks and fan are located further away from the card, some form of heat transfer needs to be in place on the chips.

HEAT can burn anything out, it's just a matter of time, why chance it? Degredation.

Apexing
06-22-2013, 02:53 PM
ah damn, could not find any thermal pads with high w/mk, so will have to stack the ones Im getting in a layer of two, perhaps with some TIM in between them to make sure its optimal. Tho will have to wait and see, since you are just using tim for yours Im sure it will work, cant imagine you used a 1m thick layer of tim ^^

Dreamonic
06-22-2013, 08:39 PM
of course not, 1mm is used for the pads for compression spread when sink is tightened.