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.
When comparing partner cards that are all based on the same architecture, GTX 780 in this case, benchmark performance is dictated by the in-game frequencies. Asus loses out to the other three GTX 780s for this reason alone.