Check out these quotes from ZOTAC GeForce GTX Titan reviews & previews
"While we have not tried every GeForce GTX Titan available it is clear that the Zotac GTX Titan AMP! Edition is one of the fastest cards available right now. It offers a definite increase in performance over a regular Titan."
"AMD do however have a great game bundle with the 7990 which tips the value scale a decent amount but if money is no object then we would always opt for a fast single GPU product over a dual GPU model and ZOTAC/NVIDIA have done well to create the fastest single GPU card we have tested to date."
"While some sites reported pricing of $1029, $1100, and pretty much everything in between, ZOTAC today told me that the retail price will be $1139, which is a tough cookie to swallow. More than a 10% price increase for just the overclock and three bundled games is really too much in my opinion. I would have considered $1029 a great price and $1049 reasonable, but everything above that doesn't seem to be worth it. NVIDIA recently upped their game bundle to include Metro: Last Light, one of the hottest titles this season. ZOTAC also bundles three Assassin's Creed titles that could be sold to offset the price, but either way, it's still a lot of money to spend on a graphics card, and most users won't be able to do so. I was prepared to give this card our Editor's Choice award, but pricing deprived it of that. Going by forum reports, those who bought a Titan are extremely happy with it and don't regret spending the money. On the other hand, the GTX 690 comes at similar pricing and is faster but requires optimum game support. The rumor mill is also very active when it comes to the GTX 780 that is supposedly based on a design very similar to Titan, with the same GPU. Pricing is completely unknown though, but waiting a bit to see what's coming might not be a bad idea."