The first bios to officially support it (as was on the site) is 2302.
Also, some site managed to get a QX9650 working on the P5W64 WS Pro even though it wasn't "officially" supported, so normally this applies to the P5W DH as well.
To matomatala, I don't think anything can go wrong besides it not POSTing like mentioned above. It will probably boot with a lower FSB if at all.
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