C/W IS a valid way of comparing between different systems.
IF you can measure the temperature and wattage correctly.
However many tests don't measure the temp in a correct way and therefore any comparison is meaningless.
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If it ain't broke, fix it.
Setup:
Dual Duron 1100 | Voodoo 3 2000 | Addtronics W8500(WTX) | Eheim 1250
| Car radiator | 2 Innovatech WB |
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