Some of the newer revisions of AM3 board will support AM3+ chip through a BIOS update - CONFIRMED. They do mention support though, which leads to beleive there will be limitations if not using a native AM3+ board.
Selected AM3 Boards will get a bios update to allow AM3+ CPUs, however you will be missing some power management features that is accessible through the 942nd Pin on the AM3+ Pin-Array / AMD 900 Series Chipsets.
Also the 8xx Series Chipset's HyperTransport 3.0 (up to 5.2GT/s) don't have the HT Link speed of the 9xx Chipset's HyperTransport 3.1 (up to 6.4GT/s). So You may not be able to put the 8 Core Bulldozer in a AM3-941 Pin board, or if you can it will have a crippled H.T. Link Speed.
Not to mention AM3+ w/ 9xx Series supports both SLi And XFire.
Edited by SkateZilla (09/26/11 01:05 PM)
HAF922, 700W OCZ, ASRock Fata1ity 990FX Pro,
Corsair H100,AMD FX8350 @ 5.15GHz, 16GB G.SKILL Sniper@DDR2133,
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WD 1.5TB Black SATA3, SG 1TB SATA2, 2x SG 500GB SATA2, 1x SG Ext. 1TB USB3