I bought this primarily to power my 2560 x 1440 PC monitor due to it's appealing benchmarking figures from a number of tech sites. I had considered getting two GTX 680s to run in SLI, but the lack of vRAM was always going to be an issue at this resolution. I had also considered the GTX 690 as I always prefer a single card solution to a multi GPU setup due to temperature , noise and power draw costs.
The GTX Titan was the standout product in the end, in that it offered a single card solution, a massive 6GB of vRAM to push the 2560 x 1440 resolution and keep it from stuttering and Nvidia's brilliant driver support. I'm also not ashamed to admit I'm a big fan of Nvidia's proprietary Physx technology, which this card handles with ease.
Some rough benchmarks from my own setup ( Intel i5 2500k overclocked to 4.2Ghz, 16GB DDR3 at 1600Mhz, ASUS PZ77V-LX motherboard).
Borderlands 2 runs at a solid 60fps at 1440p with maximum graphics settings and Physx.
Battlefield 3 runs at 60fps on Ukltra settings.
The downside of the GTX Titan is, predictably, the cost. At launch the card was £925, over double the cost of Nvidia's next most powerfukl single GPU, the GTX 680. It's also a large card, which may prove too big for some cases, especially those below a full tower sized case
Asus GeForce GTX TITANWith the DNA of the world's fastest supercomputer and the soul of NVIDIA