Its been
confirmed that the 2900XT needs 2x6 to work at stock speeds and 8+6 to overclock.
Strangely enough, the only difference between a 6 pin and 8 pin plug is that the 8 pin has 2 extra black common conductors. No extra 12v power at all. There is talk that in the future the PSU will use one of the wires as a sensor, but not yet.
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