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.
We fully expect the GTX 760 to be slower than the GTX 670 - it loses out on one entire SMX unit, after all - and the latest version of 3DMark also sees it this way.