Since the XP produces a large amount of heat you need a pelt bigger than 150W and I don't think your Volcano can handle the 200+W of load that both cpu and pelt will produce.
If you plan on using pelts on AMD chips then WC the hot side of the pelt is the only way to go.
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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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