In terms of gaming, it's an inferior product to NVIDIAs other SLI solution AKA two separate 780-Tis, well, except for situations in which the 3GB VRAM of the 780 Ti becomes a limiting factor, and in situations where you would want to run quad-SLI but you have less than 4 PCI-E slots.
In terms of dual-GPU units only - after a quick look around it seems that the AMD Radeon R9 295X beats the NVIDIA GTX Titan Z quite handily. The R9 295X is literally half the price ($1500 vs $3000)! Imagine a $350 AMD card (something in-between a 7970/280X and an R9 290) being, most of the times, faster than a $700 NVIDIA card (780 Ti), it would be ludacrous.
- The HD 6990 was the same price, give or take, as two 6970s.
- The HD 7990 was the same price, give or take, as two 7970s
- The GTX 590 was the same price, give or take, as two GTX 580s
- The GTX 690 was the same price, give or take, as two GTX 680s
And the pattern kept on before that too, and it only makes sense as you are just pretty much buying 2 of those cards. The massive pricing difference between the Titan Z and with just buying 2 of the same cards of which the Titan Z is based on (two Titan Blacks, I believe) is completely different from all other equivalent card pricing philosophies of the past (around the same price, give or take, as purchasing the two cards separately).
