After consulting some TEC experts we have come to a reasonable conclusion. My 500W PSU will not work with both TEC units. due to the fact that my 12V rail only supports a max 28 Amps. I would require a MINIMUM of 30 amps too run them both. So in that case a TEC on the CPU will be prime and work perfectly with my 500W PSU. They have address the possible concerns for known problems with TEC.
__________________ _____________________________________ If you can't beat it... SMASH IT!!!