Wet-Sanding The North Bridge (Continued)

I was kind of "furious" at that time because I just wasted hours sanding my custom-modified Pentium III heat sink! I was expecting the new nForce2 Ultra 400 north bridge to be totally flat. But when the heavily-sanded heat sink repeatedly failed to make full contact with the north bridge, I checked the north bridge and found that it was not flat! What a waste of time!

Furious + disappointed = no brain. And so I started wet-sanding the north bridge with 1200 grit sandpaper! Only after two hours of sanding did I discover that I was using 1200 grit sandpaper! &%$#@*&!!!

I rushed back to the DIY shop and got myself some 600 grit and 800 grit sandpaper and started sanding all over again!

uhh..ahh..PAIN!

I didn't use any sanding block because it was just a minor "curve". I sanded all four corners for a short period, checked the flatness of the north bridge using a ruler, sanded again, checked again and cleaned up.

I also applied a little water to the north bridge surface using my finger to prevent excessive heating from the abrasive action. Whenever it dries up, I just dab a little more water and continue sanding.

After sanding for some time, I applied some thermal paste and mounted the cooler. Unfortunately, the center part of the north bridge still could not make good contact. So I sanded again and checked its flatness using the ruler again. I kept repeating the steps until the surface became completely flat and the cooler was able to make full contact with the north bridge.

Ta-da! Here is what the north bridge looked like after the wet-sanding.

w00t!!! 100% FLAT...and smooth smooth :P

Now, that's one really FLAT surface! Woohoo...

Here's how the NF7-S looked like after I sanded down the north bridge.