I have an old gt7300; it has been around for 4 years and wanted to repaste it. I removed the heat sink, put a little thermal paste just to cover the graphics processor, put it in and fired it up, it worked for like 5 minutes while just viewing bios then pc started to restart over and over, I removed the card and its heat sink was burning of heat.
Let it cool a little bit then removed heat sink, the paste was evenly on the processor and nothing wrong, I have put it in another pc and repaste everything but it is not working anymore, i have done many repastes for the cpu with no problems what so ever.
I just would like to know what I have done wrong to avoid it next time; also the original paste was like pink glue it took me sometime to clean it from heat sink and graphics processor.
dont know really...
maybe some of the paste (or some of the old paste) got under the chip onto the solder joints making shorts and causing excessive heat output. Though there should be underfill compound underneath the chip, so it shouldn't be possible for something like this to happen. There is a gap between the chip carrier substrate and the actuall printed circuit board, but it would need one major 'Oops' to get the paste in there...
And because the heatsink gets hot, it shows that the thermal interface between the sink and the chip is good.
Is the heatsink itself clean, so no dust in there?