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've been expecting interesting results and 3DMark doesn't disappoint. In the Fire Strike and Fire Strike Extreme benchmarks, two GTX 960s scale well and deliver a level of performance that isn't too dissimilar to a top-of-the-line GTX 980.
But if you've got this amount of power, you want to be playing at ultra-high resolutions, and look what happens in the 4K Fire Strike Ultra benchmark. The GTX 960's frame-buffer limitation rears its ugly head, where the two cards in SLI simply aren't able to cope. When memory demands are high, two GTX 960s aren't able to compete with a single 3GB Radeon R9 280X, let alone a 4GB GTX 980.