Benchmarks - 3DMark 11
3DMark 11 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.
The EX OC benchmarks remarkably closely to a full-fat GTX 680, and it's comfortably faster than a price-equivalent AMD Radeon HD 7970. So why is it performing so well when based on the GTX 670's reduced architecture? It has all to do with how much the speed of the core/shaders is being increased by the GPU Boost function.