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.
The synthetic 3DMark benchmark suggests that Asus's card will be the fastest Radeon R9 290X we've tested to date. A worthy accolade, and one that makes the DirectCU II OC the fastest sub-£500 card on show.