The official GT300/Fermi Thread

[Calmatory]

Nvidia it self is promoting CPU-GPU software that means the GF100 cores will be used in higher percentage than games. Other than that the GF100 seems to have 8 + 6 instead of 6 + 6, if rumors are to be believed and GF100 does eat around 230W spread around 8 + 6 and PCIe slot the X2 would most likely have 8 + 8 instead of 8 + 6 used in GTX 295 "If a shrunk is not used"

Still the power consumption must remain under 300 W in PCI SIG's internal testing, otherwise the card does not meet PCI-Express standards and hence can not be sold as PCI-Express compicant device. Oh and there is only talk about 6+8 pin in the standard, as far as I know.