3DMark Fire Strike
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.
There's a fair amount of variation when it comes to specified clock speeds on custom GeForce GTX 1060 cards, yet they tend to boost to similar levels and the trio on show is closely matched in the synthetic 3DMark tests.