Gx640 Backfire

So I was getting fed up with the high temps of around 95C even with a decent ambient temp, that I decided to swap the thermal paste. Bad idea.... The cpu temps are fine high 70's on load, but the gpu got to 90 within 30 seconds of playing anything. Then within a minute or so it got to 100 then another 15 seconds later it got to 115 and shut off. The fan doesn't even go into the ultra fast cool down it used to when it got to 95. My question is what are my options now? because this sucks.

 

Remove the thermal pads from RAM chips on the GPU and substitute them with thermal compound. Also, remove the meshes covering the vents on the laptop's bottom cover.

 

I am doing this exactly tomorrow because i forgot to get the TIM remover. I will report back asap my new temps. So far I reach around 92oC max on SC2 and BC2 both maxed out and idle 60oC (5850m OC of 700/1000). My CPU maxes around 85oC on SC2 but on BC2 it reaches around 75-80oC. These temps are not bad i suppose are a thin chassis but i have the time and money to lower these temps

 

Alcohol is a good TIM remover, for future reference. I'm going to disagree with Marecki and say that you keep the thermal pads there. The thermal pads serve not only as heat transfers but also as cushions. If you want to switch out the thermal pads, I suggest you go for different thermal pads, not paste.

 

There will be a minimal gap between the heatsink and RAM chips after thermal pads removal, so the cushions theory is a load of bs.
The GPU core is more fragile than RAM chips, yet there is no "cushion" between the core and the heatsink.

 

I was thinking about removing the pads, but won't it void the warranty? And if it does couldn't I just purchase thermal pads that look the same from ebay or something? (EDIT: Not too sure about this because a lot of people are saying it might damage the gpu in the long run) Any ideas to why the fan didn't go into the last phase as it usually does? Or is it supposed to do it when both gpu and cpu exceed high temps?

Thanks

 

I removed the thermal pads as soon as my laptop has arrived. After 6 months of use I've had 0 problems with it. You could buy thermal pads from ebay, there are plenty of them there.
As for the fan, try removing the battery while plugged in and gaming.

 

I removed the pads carefully with a razor blade, and I had a pretty significant temp drop. Thanks

For future reference, anybody worrying about the pressure on the vram chips, there is hardly any pressure, because the gpu core is elevated higher.

 

How about the fan and battery removal? Any improvement?

 

Well, since the temperature doesn't go near 95, I don't think I have to worry about that anymore, I guess :\.

 

If they dont reach 100oC then you should be fine

 

What thermal paste did you use?
I heard MX-3 is the best and its easy to use.

I think you should have better temps than that.

Did you use to much thermal paste?
This video helped me know how much to put:
YouTube - How Thermal Compound Spreads (MX-2 Edition)

Try reapplying the paste.

 

Just wanna chime in here. It's been a while since I've been on. First off, just changing the paste will solve nothing. This is something discussed ad nauseam on several threads here. To reiterate: it's a problem with poor contact between the GPU die and Heatsink. MSI apparently is aware of the overheating issues with these models and has addressed it with thinner thermal pads. I ordered a new heatsink for mine a while back and finally got it today. It's basically the same as the original heatsink except it comes with much thinner thermal pads for the GPU RAM (about .5mm thick). The old pads were about 1mm thick. I ran a 15 minute furmark and the GPU reached 93C, so things are pretty much good now. If you guys remember I also did the copper shim a while back and that yielded pretty good results as well. So basically you have the option to: 1) Replace the pads with thinner ones; 2) Add a copper shim; 3) Remove the thermal pads completely; or 4) Leave it the way it is. I would recommend one of the first two options.

I also see some people putting thermal paste on the RAM chips. I tried this way back as well and would not recommend it. The reason is because first off, the paste has to be piled on pretty thick to make contact with the heatsink, and then once the chips heat up, the paste will permanently stain the surface of the RAM chips which will be noticeable and almost impossible to completely remove. The RAM chips are made of a rough, almost sponge-like material that absorbs the paste. There you may face warranty claim issues.