Well, Asus does promise compatibility with Bulldozer, sure a few features wont be available. We dont know which ones yet, but most likely Cool&Quiet and Turbo Core.
Not to mention, Asus was told by AMD to make the Crosshair IV and m4a89 boards compatible with a bios update or obviously got the permission to do so. I doubt AMD would tell or allow Asus to build boards meeting certain specs cap and promise something knowing it would cause widespread grief. Or perhaps I have too much faith in humanity xD.
As I had said, we don't know which of the new (IE, this june) bulldozer cpus will be compatible with the bios update, but we can bet that at least one of them will be, but such information should be provided at launch.
As I also stated, I fully expect E-Bulldozer to only be supported on true AM3+/990fx and not be backwards compatible as Asus says the bulldozer being released this June will be.
The only thing I can see going wrong and giving grief is if you try and OC one of the bulldozer chips on a 890fx board, but if the archi is good enough it'll still prove a great improvement over a 955 @ 3.8GHz when its at stock clocks so that would be fine for me...until I snag a Crosshair V.
I am still inexperienced but I have faith in Asus and AMD, maybe a little too much and maybe im a little too young and naive. But I never make a final descion or purchase without seeing cold hard proof first. Edited by Davitz - 5/20/11 at 11:13am