Crysis Warhead Benchmarks
 

The Cry Engine was not only said to be visually upgraded, but also in regards of the performance. You still need a high-end card, but all in all Warhead is running a little smoother.

At high details the Geforce GTX 280 is up ahead with the GTX 260 and the HD 4870 behind it. With a 9800 GTX+ or a HD 4850 Warhead is slipping down to the average framerate level. The game is slow on anything lower than a 8800 GT. At maximal details the Radeon HD 4870 is the winner, but even on this card Warhead is unplayable with those settings.

http://www.pcgameshardware.com/aid,6...e_game/?page=1

Crysis Warhead DX9 vs DX10 shots here: http://www.pcgameshardware.com/?menu...mage_id=897507

water refractions slightly better with DX10, smoke more dense. That's about all I could see, running DX10 drops performance same as before