The NVIDIA GeForce GTX 770 is based on the Kepler GK104 graphics processor. The GTX 770 can be considered a rebranded GTX 680 since it uses the same processor but there have been many upgrades. The GTX 770 now comes with higher clock speeds, 7GB/s memory modules with a peak bandwidth of 224.3 GB/s, GPU Boost 2.0 and will come in two different variations, 2 or 4 GB. The 4 GB version focuses on those who crave the gaming experience of multi-monitors or ultra HD resolutions."
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips