As we’ve mentioned, the Catalyst v8.3 driver suite will officially support three and four GPU CrossFireX configurations. You may have heard some scuttlebutt over the last few weeks stating that CrossFire works with some mismatched GPUs as well, which is actually the case. AMD's new Catalyst v8.3 drivers will let users match up Radeon HD 3870 X2 cards, with standard 3870s and even the 3850 - basically any RV670 / R680 combo will work. This is interesting because it adds some level of flexibility to end-users looking to take advantage of a multi-GPU setup. Three-way CrossFireX configuration can consist of three Radeon HD 3870 cards, or a single 3870 X2 and single 3870, for example, or any other combo of HD 3800 series cards. And four-way CrossFireX can be achieved with a pair of Radeon 3870 X2 cards, or four standard 3870s, etc. We should note, however, that three and four-GPU CrossFireX is only supported under Windows Vista and only with DirectX 9 and some DirectX 10 titles at this time. Full Support for DirectX 10 (with four GPU scaling) and OpenGL will come at a later time, although Call of Juarez happens to be one DX10 game that does scale currently with four GPUs. Also note, two card CrossFire is obviously still supported in XP; it's just the three and four GPU setups that are exclusive to Vista.

So there appears to be quite a lot of changes in this version of the Catalyst.