AMD ATI Radeon HD 4850

Very interesting results, especially Crysis. Given the feature set is identical between the 4850 and 4870 you'd expect the only differences be due to slightly increased clock speed and significantly increased memory bandwidth. That being the case the OC'd 4850, especially if the memory is OC'd, should bring performance closer to the 4870 - as in fact the other games show.

So what's going on in Crysis - driver optimisations for the 4870? Heat throttling for the 4850?