I remember (don't know who anymore) someone saying that as5 on the northbridge is bad, i can't find anything to back that up. Anyone know why?
I think that I said that once. The person who I responded to was having some overheating problems with their chipset cooler installed with AS5, so I suggested they try another, more forgiving paste. I don't know for sure if AS5 was the cause of the problem. I was just guessing that it could have been a contributing factor.
I didn't exactly say AS5 was bad, but it is a bit less forgiving of an incorrect installation technique than most thermal pastes, primarily because it is so dense and does not spread as easily as other pastes. This is often exacerbated by the fact that many people use too much AS5. Some CPU manufacturers will not provide a warranty to people who use AS5, because it is so often applied incorrectly.
The fact that AS5 is so dense and typically chipset coolers are installed with fairly weak springs which exert much less pressure than CPU HS clips, makes AS5 even more prone to problems if too much or uneven application of paste is used.
One thing I noticed about all the SPCR reviews on this site is that they use AS Ceramique because they say it is easier to use and less prone to problems with improper installation. That applies to CPU’s, GPU’s, and chipsets.
Well you are straight up making things up on most of those points (go look at Arctic Silver's site for the amount of surface area AS5 covers vs Ceramique), but I do agree with your end point. I have lost a good number of motherboards, shortly (<- shortly! :lol ) after applying AS5 to the northbridge. Maybe the traces are closer to the surface and it seeps in? (well that sounds like a load of crap, too, but I can't explain it!) On the other hand, I have applied AS5/AS3, many, many times to multiple GPUs, ramsinks and CPUs and never had any problems.
It could just be possible that to remove the northbridge, it's hard to do it without touching a lot of pins and traces on the motherboard. ESD does not necessarily kill electronics immediately. It can cause enough damage that voltage will erode the rest, so it could take a few days to kill something.