Sounds like an interesting experiment
This is simply a cold box, how ever a very cold one. Many things to consider before a test can even be started because I think several have done simular things on XS.
This box sounds like it can cool objects to very low temps, but what about objects that emit a large amount of heat. A CPU at high over clocks can output a great deal of heat, something like 700+watts if using AMD cpu's, and that does not take into effect anything else such as GPU's, NB & SB chips plus anything else.
Other things like componets on the MB like Caps, can they stand extreme cold, some cannot. Other pieces of hardware like HDD's cannot stand the cold, SSD's might be able to tho.
So the question then becomes if this box uses LN2 like what you say for a object that does not emit any heat, how much LN2 will it use keeping these hot objects cool. I would suspect a lot more and that brings up is it more effecient to just use a CPU/NB/GPU pot to run the test.
In this beast of a machine he still uses a chiller coolent system for the CPU and perhaps GPU's while everything is in a sealed chilled chamber.
http://www.xtremesystems.org/forums/...d.php?t=160872
Good point there Kal about CB's
Some motherboards have a CB effect, the AMD boards I have used do not and can stand max cold, I do not believe the Classy can do that. A lot of Intel CPUs CB at warmer temps than max LN2 temps, while AMD do not.