what's the key of the graph card performance about ATI card?

[perlish]

what's the key of the graph card performance about ATI card?
the number of the Stream Processors ?
the memory size?
the FLOP capbility?
or some thing others

[Rolf]

If you're comparing the same generation(7xxx, for example), then it's the number of stream processors(shaders) and core clock.
The higher, the better.