liquid nitrogen cooling a possibility?

[William Park]

Most electronic components have temperature dependent performance, and
the temperature ratings that you normally see on a specs are the range
where the performance is fairly predictable and constants.

The trick is just to cool the CPU and leave everything else on the
motherboard untouched.  So, why not put dry-ice (CO2) on top of CPU?
You would need something to hold it in place on top of CPU, and the
dry-ice dimension can extend vertically.  I'm thinking long rectangular
or round stick, freely held vertically from CPU, so that as dry-ice
evaporates it will drop down.

-- 
William Park, Open Geometry Consulting, <opengeometry at yahoo.ca>
8 CPUs cluster, (Slackware) Linux, Python, LaTeX, Vim, Mutt, Sc.