I can't wait to hear Gaara's comments on this one.
This approach is actually better than SLI or other multicard technologies IMO as you're still only buying one card and the company itself has actually put some effort into building some more sophisticated than simply soldering on a small interface to the card and allowing you to link the card to another card via a bridge
That being said...it's still poorly optimized and I most certainly wouldn't buy it as they're simply taking an extra step to modify the PCB for two cores and linking them through some sort of onboard bus that most likely suffers from latency issues
The only multi-GPU implication that would work would be actually manufacturing two cores onto one die similar to recent multicore architecture found in CPUs...and then write rendering instructions with multiple threads...this way the workload between the GPUs would actually be split evenly 50/50 rather than simply splitting the screen in half and assuming it's 50/50 when 99% of the time one GPU will be under more workload than the other
Of course I assume there are numerous reasons why GPU manufacturers haven't implimented dualcore GPU architectures...the first being the thermal specifications of GPUs are much hotter than GCUs and multiple GPUs on one die would most likely create a tremendous amount of heat...the second being the fact that most game developers and nvidia/ATI driver creators don't want to go through the extra trouble writing multiple thread instruction sets...and the third being the fact that they're lazy, they're happy with SLI because people are buying it and making them money
A multiGPU on one die would of course have it's advantages...the first being the production and retail cost of having 2x7800GTs on one die and thus one PCB would be much less than having to built two PCBs with two seperate GPUs...and of course the GPU itself would be ridiculously powerful...also the fact that you're reducing latency and getting bandwidth of the effective core speed rather than using an external bus to link two seperate GPUs together
As I've said, money talks...you don't buy SLI, they rethink their strategy and possibly move onto new innovations such as multiGPU on die architectures...boycott SLI and it will most certainly go away
This is a step in the right direction, but it's still a wrong step altogether