One of the mounting holes for the server board is located quite close to the CPU:
A quick look at the two holes for the CPU heatsink assembly leads one to observe that the hole where the screw goes may be hidden . . . or, at least it does after the fact:
This particular board has the various sockets and slots arranged quite differently than previous uniprocessor server boards.
Now, it is our preference to install the heatsink before the board is installed into the chassis. We have one half of a large Styrofoam 30 hard drive carrier tray that we use for the board to sit on while installing the heatsink.
We do this because there is a significant amount of down force required to seat the heatsink mounts which caused most boards to flex _a lot_ while sitting in the chassis.
It looks like we will not be able to do that for any of the servers we build on the Intel server board S3420GP series.
On the plus side, the new heatsink configuration that comes with the Intel Xeon Processor 3400 Series does not require that much force to install on the board.
Microsoft Small Business Specialists
Co-Author: SBS 2008 Blueprint Book