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.
This popular synthetic benchmark tends to favour AMD Radeon GPUs. We're pleasantly surprised by how well the Radeon R9 285 does, irrespective of the overclock, and improved performance is a function of a more efficient back-end in concert with a beefier (Tonga-infused) top-end.