Thermal Pad

So I recently decided to open my laptop and replace the thermal paste.
I own a HP DV4T
graphics is NVIDA 105m
and A DUO core of P8700

when i reached the cpu and gpu, there was a huge chunk of this gray thing, which I did not know at the time was a thermal pad, so I removed it and replaced the gpu and cpu with AS5

Now the temps of the gpu is jumping around a lot going anywhere between the 50's at idle and 90+ with load, and my question is do I need to replace the thermal pad? and if I do does anyone know what the thickness/width should be?

please give me advice on what to do
thank you

 

You probably need to replace it. It was probably located between the memory on the gpu and the heatsink. Without any form of contact, the memory would overheat like crazy. I would advise 1mm thickness, since I believe that is the standard. Buy from frozenpc or some other major computer retailer.

 

thank you! and yes it was located between the gpu and the heatsink, I didn't know what it was until I did a little more research but by that time it was too late. Just to make sure the putty like thing is the thermal pad right?

 

Find out if you can run it without the pads. When I repasted my 8400M GS I removed all the thermal pads and used ceramic based TIM on the GPU die and the VRAM.

 

Well I am running the laptop without the pads at the moment with AS5 on the gpu, but the gpu temps are not as steady as the processor, and underload the gpu gets way too hot I am not sure if it isn't making contact with the heatsink or it needs to be cure? Should I go and buy ceramic paste?

 

I have also found this site, should I order these pads from here? EK Waterblocks Thermal PAD BIG 1mm Thickness (60x50x1mm)

 

you could get a little copper die off ebay for it and use a paste
that will sort it.
thats what i did on mine, works a treat

 

by copper die do you mean copper shims?

 

i think that's what he means. That way, because copper is so thermally conductive, you will get better heat transfer than just a glob of paste.

Also, are you saying you took out the pad and put paste where it used to be? If that is so, I dont get why the temps are so high, paste is way better. But if you took the pads off of somewhere else, then that would be the problem

 

I would be wary of using copper shims. If improperly seated or applied they can destroy a GPU die.

 

Tsunade_Hime is right.

If the shim it to thick it could crush the GPU die when you tighten down the heatsink.When you do this stuff you need to measure things.

When I did mine I used the thermal pad I took off for my measurement.Cut it in half and put a micrometer on it where the gpu came into contact with it.

 

So I took apart my laptop again and redid the paste, this time i added a little bit more of AS5 on the gpu and on the heat sink and made sure that the gpu and the heat sink was at least touching.

Temps for the core
~30-35 Celsius at idle
~40-45 celsius under normal use

Temps for the gpu
~40-45 at idle
~60-65 at normal use

I am going to wait a little bit longer, about a week or soo, to see if curing will help at all, if not I will probably buy some thermal pads instead risking my gpu for copper shims

I haven't done any stress tests on the new thermal paste probably with prim 95 for cpu and fur mark for gpu when I feel that the thermal pastes had cured

My only question left is, should I be worried about AS5 being on the gpu? I've read somewhere on the web that AS5 might do some harm on the gpu but I am not sure. If anyone has any input in this it would be greatly appreciated.

Thank You