Both AMD and nvidia's offering of a dual gpu card is going to be well over 650w for the card alone![]()
No it won't mate, a dual GPU single pcb setup is more power efficient than 2 cards.
The GPUs will be seriously downclocked in both core and ram compared to their full fat counterparts.
As an example the 6970 is rumoured to be 900Mhz+ core whereas the 6990 is rumoured to be 775Mhz core, of course these figures must be taken with a pinch of salt but they are a good example of what we will see.
i cant imaging 4gb being useful at this stage, not that we know how one of those gpu's would perform with 3gb