3DMark
3DMark is the latest version of this hugely-popular synthetic benchmark. Making use of DX11 features such as tessellation, compute shaders and multi-threading, it provides modern-day results and is available as a free download.
Nvidia's revised GTX 680 doesn't quite have enough horsepower to overtake the Radeon HD 7970 GHz. The GTX 770 is around eight per cent faster than GTX 680 here.