The Iceman Cometh: P4 at 4.1 GHz

Overview: Cooling System Design, Continued

The evaporation temperature of the R134a coolant is minus 26 degrees Celsius at normal pressure (1 bar). Danfoss quotes an operating temperature of - 10 to - 35 degrees Celsius. - 35 degrees requires a vacuum of 0.5 bar. In theory, temperatures of up to minus 100 degrees are possible - given enough vacuum in the cooling system.


The cooling system has its own power supply with fuse and relay.

A view of the cooling system's heat exchanger.


Cooling system temperature indicator and control buttons.

New switch-on circuitry from Chip Con designed to ensure that the PC only switches on when adequate cooling levels are established.
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