Thernmal pads gtx 780m

Hi, I will repaste the gtx 780m and want to tahe off the old thermal pads and put new ones...I bought
Jun Pus JP-P600- 6w/mK 50x50x1mm
Phobya pad XT 7w/mK 12x20mmx1mm

I know on vram it's recomended 0,5mm...it's a small difrence 0,5 and 1mm...I read on internet that someone used 1,5mm...what to use for best themps?
The paste shood apply it with a center bob or middle line? Pk-3 it's ok to spred only with the force of heatsink?

 

Hi ,

When it comes to heatsink contact very small measurements are critical in obtaining the best results - nice low temps.

Things that can go wrong include, pad too thick and fully compresses putting the board under stress and reducing the contact of nearby components. Pad too thin - no contact with the heatsink at all .

For the paste, there are a few methods and all work just fine but getting the amount right, although not critical, can cause issues. For this reason I recommend spreading a layer as thin as you can using a credit card or business card. Too much paste and along with a mess it is theoretically possible to create a 'hydraulic' where the paste actually holds off the heatsink - one of those classroom things that never happens in real life (IMO).

When I am unsure of pad thickness's there are a couple of ways to check it out. Put your pads on and dry assemble. Use a flashlight to look and see if all the pads are in contact. Leave it for a couple of hours and open it up. There should be nice dents in the pads of up to 0.25 if they are mating correctly. More than that and the pad may be too thick.

The second is what I would do if I did not have a diagram. That is to use small balls of modelling putty on each component and some talc on the heatsink. Assemble and then carefully open up. You want to pad to the next 0.5mm up from the thickness.

Having said all that it's usually OK if you don't get it exact, it's the difference between a sweet low running card (I never see above 65c fully overclocked!) and one that just meets specs - in the high 70's. So you are unlikely to damage anything and a quick in-game temp monitoring will show how successful you have been

Good luck

 

I will change my pads, and put them like in the image that I posted (hopefuly that is the best way), the thermal paste I will but a bob of rice and compress it with the heatsink, at this moment cs go is putting my gpu to over 75 degrees...almost 80 compered to gtx 770m that never passed 60 . Thank you

 

I'm sure it will be Ok. Just make sure you double up on those components at the edge (2mm and 'fill gap' on image) as these are the voltage regulators and run very hot. They are designed to run around 100c but they warm up stuff nearby