If we look at the PCB (this is the reference card btw) we can see two SLI connectors, four cards in quad-SLI GPU mode are supported. Quad SLI however is difficult and often a maze of driver problems, Nvidia has never really recommended and actively supported quad-SLI. But for a handful of benchmarks and sheer e-peen, it will work OK'ish. We really recommend to go with a maximum of 2 maybe three cards.
The board makes use of quality RAM ICs from Samsung. This is high density GDDR5 memory, Nvidia tucked 3 GB of graphics memory on this card (24 pieces of 32M ×16 GDDR5 SDRAM). 3GB we feel is a sweet spot for high-end anno 2013, but with Ultra HD gaming in mind I feel 4 GB should have been the minimum.
The card is 27 cm in length. For the GeForce GTX 780 Ti launch we'll have multiple articles ranging from single GPU to 2-way SLI. We'll also look at performance based on high-end yet more moderate processors and then on the X79 platform with an overclocked Core i7 3960X running at 4600 MHz.
So overall you are going to witness some pretty interesting stuff in the upcoming days alright.