I am happy I joined this site! There is never a question that I have that cannot be answered with a search in this forum! My CHV-FZ's northbridge was sitting at 51-57 Celsius (via HWiNFO64) while everything else was in the 20's and low 30's. I did not like seeing one temperature that far above others.
The heatsink on this board is all screws which is very helpful in removing/installing, however, if you're going to replace the TIM as I did, be prepared. The stock garbage, which ASUS puts a 5 mm thick layer of, on the heat sink is this thick, pink, bubble gum looking crap. I have worked with a lot of "stock" thermal junk in the past, I have never worked with such a pain in the a$! as this stuff.
I am not recommending to do what I did, heck I did it as an experiment and I am glad that I didn't eff anything up, but for the heatsink (NOT THE CHIPSET!!!) I used 600 grit sand paper to get the goo off, I didn't have much of a choice at this point. Once it was off I went over it with 800 grit, then 1000 grit, and lastly 1200 grit (I don't have anything more fine than 1200, this is why I was praying it would work!).
I cleaned all that off with alcohol and coffee filters (unused f course
) then gave it a finer cleaning with alcohol and a q-tip, then back to the coffee filter.
I put a tiny drop of Arctic Silver 5 on the heatsink, used my trusty "Green Smoke Member" plastic card to spread it very thin, found it was still a little heavy, so I used another coffee filter to remove some of the excess, then re-spread with the card to get it nice and smooth with no craters or other blemishes. Of course after that I installed it back on to the motherboard.
One thing to note, the stock VRM thermal pads are junk as well. Unfortunately I did not have anything to replace them with, so they stayed, but they are really garbage, another project for a rainy day.
After reinstalling and connecting and all that fun I am running at 35 Celsius idle and 40 Celsius under load (gaming, haven't run an actual stress test yet). I am pretty happy with this. There is no fan on it, I am thinking of installing one for the heck of it, blowing right on the heatsink. I was pretty impressed with what the Arctic Silver 5 alone did, so that is good news! I was also happy to see that my sanding job did not screw anything up.
I personally would not recommend the sand paper thing. I can see if someone has a machine that can "plane" metal to a uniform thickness with a .000001 tolerance in surface blemishes and all that...I don't have machines like this. I took a chance with sand paper, and despite it actually working, I am sure the surface of the heatsink under a scope would look like moon craters, this is why I would generally advise against it, well, one reason anyway.
Victory is mine! Edited by ThisMaySting - 7/12/13 at 12:23pm