In my previous post I originally suggested that the new 256MB ATI graphics were more powerful than the previous top end iMac's GeForce 7600 GT 256MB graphics. But I've since seen comments that this may not be the case, and that the ATI graphics could actually be less powerful!
Much of this depends on Apple's implementation and whether they've limited the clock speed, but it is a fact that in PC gaming ATI are lagging behind nVidia with Vista drivers so the ATI's DirectX 10 support could well be limited at this time for those who want to dual boot into Vista for gaming (DirectX 10 is Vista-only).
The 2600 Pro is also a poor brother to the 2600 XT which has 512MB memory, but Apple's decision to slim down the iMac case may have made the 2600 XT non-viable due to space and cooling issues. But I would have thought that if Apple are throwing a 2.8GHz Core 2 Extreme at the iMac, then couldn't they at least have given it high end graphics as well, even just as an option..?
Is this yet another case of 'form over function' with Apple..? And even though we know Apple don't take gaming seriously, when are they going acknowledge that there are some serious Mac gamers out here and give us decent graphics in the consumer model Macs..?