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GeForce GTX 780 Ti is a high-end graphics card and flagship of the GeForce 700 Series.
It packs a full variant of the Kepler GK110 and thus offers 2880 Shader Processing Units, 240 TMUs and 48 ROPs, on 384-bit memory interface of fast GDDR5. While the central unit runs at 875MHz and goes up to 928MHz, in Turbo Mode, the memory clock operates 1750Mz. GeForce GTX 780 Ti has the Kepler 2.0 Boost and so a even higher central unit speed is expected.
Its TDP remains similar to GeForce GTX Titan and around 250W. A modest 600W PSU should still do the job, considering a similarly fast Processor.
Benchmarks indicate its performance is over 9% superior to GeForce GTX Titan and around 8% than Radeon R9 290X and so, as of November 2013, GeForce GTX 780 Ti is the fastest single graphics card available in the market.
However, considering its release price of $700, Radeon R9 290X is still a wiser choice.