It seems as if the Radeon 6950 -- which costs around 200 EUR is a) much faster and b) also much faster per EUR than this NVIDIA card -- which costs around 140 EUR.
AMD Score / NVIDIA Score
Room: ~ 2
Sala: ~ 2.1
Ball: ~ 3.3
And the price of the AMD / NVIDA card is only 1.4. So even if you scale the result with the price of the card, the AMD hardware wins...
(AMD Score/EUR) / (NVIDIA Score/ EUR)
Room: ~ 1.4
Sala: ~ 1.5
Ball: ~ 2.3
So I'm wondering... is it NVIDIA's OpenCL implementation which is slow, is it only this specific Benchmark in which AMD wins or is AMD hardware generally better suited for computational workload?