The Guru of 3D published a review on the Nvidia GeForce GTX Titan-Z
A quote from the article:
We review the dual-GPU GeForce GTX Titan Z. The card is much talked about as Nvidia introduced the product at prices that are incredibly steep, and then, much like the Titan Black, Nvidia refused to send out samples to the media. To this day that fact has remained the same, however once cards get into retail they inevitably will end up with the media regardless of what Nvidia wants. We had to pull a string or two here and there, but we are proud to report that today we will review the GeForce GTX Titan Z. A card that created a lot of controversy, as such we'll go in-depth once again to see whether or not this 2850 EUR product even has a chance to compete with the 1300 EUR AMD Radeon R9 295x2. We test the product with the hottest games like Thief, Watch Dogs, Battlefield 4 and many more. We'll look at Ultra HD gaming, thermal imaging and heat response, we'll overclock it, we'll fire off FCAT at it. In short, you are in for a 30 page treat today.Nvidia GeForce GTX Titan-Z Review @ Guru3D
So what exactly is the Titan Z? Well, just like the GeForce GTX Titan Black and the GeForce GTX 780 Ti, the GeForce GTX Titan Z is based on two GK110 GPUs with the distinction that it has been plastered onto one PCB and covered with a humongous 3-slot cooler. The Silicons in use are based on GK110-400 GPUs, same stuff as the aforementioned cards, yet with minor changes. The recipe for the GTX Titan Z is impressive though, as the product has the full 15 Streaming clusters, thus 2880 Shader Processing Units per GPU, enabled. That's 240 TMUs and 48 ROPs on a 384-bit memory interface of fast 6GB GDDR5 allocated per GPU. So you can double that up. But in a nutshell the card uses two 45 mm × 45 mm 2397-pin S-FCBGA GK110b GPUs with 2880 shader/stream/CUDA processors -- thus 5760 Shader processors. This will give the GeForce Titan Z a cool 8 TeraFLOPS of performance.