Aren't they tinkering with a Dual core approach, though dual core has a rather speckled history.
The pinnacle of dual cores (on dual cards) was the 3dFX Voodoo 2 SLI - two cards, PLUS your main graphics, but it ROCKED.
ATI's sole foray into dual core was the ill-fated Rage Fury MAXX - the miserable drivers were a curse they took a long time to recover from.
And of course, there's the multiple core design that saw the end of 3dFX - earlier and not as punishingly expensive, and it might have saved them, instead of just being a historical curiosity.
And finally, making little impact, the Volari duo ... to little, too late, too dear - like many of the promising upstarts threatening to rise against ATI and Nvidia (where did Trident go?), they have promised much, and carried on promising.....
If anyone can make a go of multiple core, it's probably Nvidia - even if they have to cheat on the benchmark and assign the cores in optimum arrangement