Which motherboard uses the 8-phase power connectors and supports Core 2 Duo!?
Asus P5W DH has 8 phase power and doesnt have the 2x12V connector for the cpu. It's not really neccesary I think its just a second rail.
Asus P5B Deluxe has the 8 phase power and the 2x12v connector and is by the way one of the best mobos for ocing conroe.
And they should be because theyre more expensive, but the only worthy reason to get a 975X would be for crossfiring without any losses (the P965 looses some). The Abit AW9D-MAX and the Foxconn 975X7AB-8EKRS2H are the two best at OCing.
Even though theyre still owned by the P5B Deluxe at FSB and by the DQ6 at raising voltages. Thats why these are more recommended for the E6300 and E6400.