Ok but I've seen a lot of screenshots showing Mac mini running at FULLHD and a lot of eyecandy enabled. Also my old and rusty Quicksilver was able too handle FULLHD using a radeon 7000 with 32mb of VRAM.

Okay this System was running under 2.7 till 2.9 until the mainboard died.

Maybe i should try to replace the driver with the latest from the 2.x releases.