To start with, never trust the specs boosted by manufacturers.
They list either the theoretical bandwidth of their product, or the tests are about unshaded and untextured polygons.
Secondly, there is a lot more to be processed in the game then polygons alone:
-Texturing takes a hefty toll on performance, and alpha blending in particulary.
-Animation sequences for infantry fe. have to be processed and displayed.
-AI logic has to run (pathfinding, target aquisition, turretmovement, object collision, etc)
-particle and other effects...
From what I hear, people have tested up to 50000 polygons on objects before noticing slowdown...
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