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.
3DMark gets us off and running and it explains why the R9 290X is typically priced to undercut the GeForce GTX 780 Ti - it plays second fiddle in this particular benchmark.