How to choose the right thermal pad for a netbook processor?

Question

Processors

I dismantled the Acer Aspire One 722 (as the label says on it, well, Google reports slightly different technical characteristics for this name). The task was to clean the netbook from dust and change the thermal paste. I must say right away that I have done similar things before, but I have not yet reached the point of replacing the thermal pad.
So, during disassembly, it turned out that the video had no cooling at all, and the thermal pad already tired for 4 years was on the processor. I removed the gasket that was falling apart before my eyes and smeared the processor with paste. After assembly, I began to monitor the hardware and found that the processor began to heat up much faster and more strongly, accompanying overheating for a 100% shutdown of the netbook. I took it apart again - the layer of thermal paste did not even touch the plate, which acts as a heatsink! Naturally, I rushed off in search of thermal pads. It was a very long story - several cities, heaps of shops, service centers, a market ... and nothing! Only in one workshop, for the repair of such iron, a man sold me a piece of gasket about 2x2 cm in size for 100 rubles. When he asked for thickness, I didn't even hesitate to say that I needed thicker, based on the thought, that the paste didn't even touch the radiator. Seems like a waste...
I got the gasket with a thickness of 2 millimeters, and apparently on a rubber base (because it is harsh to the touch, just like rubber). I cut out a piece the size of a processor circuit and screwed on the cooling. Virtually nothing has changed! The processor began to hold on a little longer before overheating. That is, it turns out that the new thermal pad is much worse than the old one, which simply fell apart.
Tell me, can anyone come across exactly this model or similar situations, how can I solve this problem? Would it help me to cut the gasket to the width and put in a narrower piece, or is it just to look for a new gasket? It seems to me that because the pad is too wide, it does its job so poorly, but I could be wrong. Please share your expert opinion?

Answer 1

I solved the problem as follows: I dismantled the beech again, removed the same piece of 2 mm thermal pad from the processor, carefully cut the pad in thickness with a blade so that I got a plate about 0.7-0.9 mm thick. Then I applied a thin layer of thermal paste to the processor, put the resulting piece of thermal pad on top (even, the factory side on the processor, and not the wavy side that turned out from using the blade), applied another layer of thermal paste on top of the pad (more dense, I tried to fill all the cavities with thermal paste on the surface of the gasket). I screwed a cooler with a radiator plate on top.
After all these manipulations, the maximum temperature that the processor reached under load was 93 degrees (the beech turns off as soon as the temperature exceeds 100, that is, 101 degrees = processor overheating). But at high temperatures, it does not linger for a long time. On average, under load, the temperature is kept at 65-85 degrees.
By the way, I also reinstalled windows, after which the beech began to think much faster. It was windows 7 ultimate x64. I replaced it with windows 7 home premium x86, since the processor is rather weak for a 64-bit OS, and the 4 GB RAM is seen and used by the 32-bit home premium version without problems.

Answer 2

in such cases, I take a coin of a suitable size (non-magnetic) and on emery (sandpaper, grindstone, etc.) I bring it to the form of a pancake, a little thermal paste on both sides and it sits better than any thermal pad, but this design is far from copper, but anyway better than any thermal pad.

Answer 3

The thermal conductivity of rubber is nowhere worse, some kind of nonsense, I would rather try to "stuff" the thermal pad out of foil, or smear thick thermal paste, and in general, the heatsink should be pressed tightly against the chip.
What kind of video is there in a netbook, it is integrated into the processor, and this is a bridge, it does not need cooling.