Why do some games run slow on radeon graphics cards?

Question

I am trying to play a codmaster game. I have a radion 128 mb card 1 gb ram 2.6 ghz prosesor .

The game works well on my slower comp with a gforce card whats going on

Answer 1

Matters what model the radeon is and what model the geforce is. Here's a few charts to compare.
http://www.tomshardware.com/site/vgacharts/index.html

Answer 2

Gaming performance depends a lot on graphics processor architecture (no. of pixel pipelines, shaders, etc.) core clock and memory clock. Your Geforce card could be better on these aspects that is why it runs faster than your Radeon card.

Answer 3

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