Now that NVIDIA's $3000 GeForce GTX Titan Z is finally out, PC Perspective was able to benchmark it just to confirm that its price is completely unjustified.
After comparing the Titan Z to AMD's $1500 Radeon R9 295X2 and NVIDIA's own $650 GeForce GTX 780 Ti in SLI, PC Perspective found that Titan Z was consistently overrun by both configurations by up to 30% in all tests.
In addition to the price difference, Radeon R9 295X2 takes up two slots only while Titan Z takes up 3. On the plus side for NVIDIA, Titan Z is considerably more power efficient and quitter than AMD's card. Nonetheless, it is doubtful that those are high priorities for hardcore games will to spend a couple thousands of bucks on a graphics card.