http://forums.overclockers.ws/vb/showthread.php?s=&threadid=35853
This is an excerpt from the above thread:
To affix all of this use Arctic silver adhesive in this ratio so you can remove it if you ever decide to move these HSF's to your next upgrade,
I have found that arctic silver adhesive works best with this ratio
Mix the Arctic silver in this blend
1part A adhesive
1part B adhesive
1part regular arctic silver II
Arctic silver's website recommends a formula of 50% part A and 50% part B if its permenent
and 50%part A and B and 50% Arctic Silver II
I find my ratio of 1part A adhesive
1part B adhesive
1part regular arctic silver II
works best as and is stronger and will hold the weight of the Alpha easily:
There is also another trick
Mix up this formula :
1part A adhesive
1part B adhesive
1part regular arctic silver II
And apply it only to the corners of the gpu approximatly one sqr centimeter on each side in the corners. and use regular Arctic silver on the rest of the GPU.
THis works well and is my current method that I used when I affixed my Alpha15u
And you can get Arctic Silver adhesive here for $9.99 shipped
http://svcompucycle.com/arsiltherad.html