3DMark
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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.
Going by past experiences, adding a second GPU in SLI will increase performance significantly, but the benefits can diminish when a third or fourth GPU is added to the equation.
With the GeForce GTX 980 and the latest-generation Maxwell architecture, we see a similar trend in the synthetic 3DMark results. Going by 3DMark's Ultra benchmark, which tests at a 4K resolution, WaterForce performance is increased by 86 per cent when a second card is activated, and then a further 25 per cent when the third card comes into play.
