3DMark 11
3DMark 11 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 Radeon HD 6450 will prop up the charts on these pages, clearly. HD 6670 is more interesting, however, as it comes out just under 10 per cent faster than a last-gen HD 5670. A slightly higher core speed and extra texturing/shading units helping out here.