HotHardware :

Finally, there's Bulldozer. This is AMD's new high-end server / workstation / enthusiast CPU. Like Bobcat, it's an all-new architecture from the ground up. AMD is steadfastly refusing to give any specific timeframe for when Bulldozer chips might be available. But Bulldozer, when it arrives, will be drop-in compatible with the current generation of Opteron motherboards as well as AM3 products, provided that your motherboard manufacturer provides the necessary BIOS update.