After succesfull overclocking I want to make some tests.
But first I have some questions:

Plese, what screen resolution/bit depth do you use on your Mac Mini? I have 64 MB VRAM, but with FullHD/24-bit only two screens fill nearly all VRAM.
What is for you most suitable?

And second question @koszer: here on Mini Benchmarks is mentioned Blender. Unfortunatelly Blender's results are differs with different resolution and mainly with different bit depth. Plese, what screen do you exactly use?