Listed below are the some of the expected boards as well as current AM2+ boards that will support AM3 Phenom II CPUs. Release dates for newer boards have yet to be published.
First reveled back in Dec ASRock is said to be releasing the AM3 based M3A790GXH/128M, however there is nothing listed on the ASRock site at this time. Here is the ASRock AM2+/AM3 Phenom II CPU support list.
ASUS currently has two boards listed in the M4 series that when released will support AM3 CPUs and DDR3 RAM. M4A79T Deluxe and the M4A78T-E. Here is a full list of ASUS boards supporting Phenom II AM3 CPUs
*Update - The is now on-sale at eWiz.com. Newegg now has the ASUS M4A79T DELUXE listed at $199.99
Today announced the TA790GX A3+, this is thew companies first and currently their only AM3/DDR3 based board.
DFI does not currently list any socket AM3 motherboards. Here is their current list of AM2+/AM3 Compatible Motherboards
ECS currently only lists one board with AM3 and DDR3 support, the A790GXM-AD3. Here is a full list of ECS AM2+ boards that currently support Phenom II CPUs
Foxconn does not currently list any socket AM3 motherboards. Here is the full list of Foxconn AM2+ AM3 ready motherboards.
Gigabyte currently offers two boards supporting both socket AM3 Phenom II's and DDR3. The GA-MA790XT-UD4P and the GA-MA790FXT-UD5P. Here is a list of all of the current Gigabyte boards that through a bios update will support AM3 Phenom II chips.
*Update - Gigabyte's AM3 boards are now showing at retailers. Newegg has the
GIGABYTE GA-MA790XT-UD4P AM3 for sale at $139.99 and the GIGABYTE GA-MA790FXT-UD5P AM3 for $179.99
Currently Jetway does not list any socket AM3 motherboards, here is the list of AM2+ Jetway AM3 compatible motherboards
Last month MSI unveiled two new AMD AM3 motherboard the 790FX-GD70 and 790GX-G65.. These are currently the only two socket AM3 boards listed in the MSI site. Here is a full list of MSI Am2+ boards that support Phenom II CPUs.
I have yet to find anything on the Zotac site listing Phenom II or AM3 CPU support
We are currently working on expanding the list to include all of the manufactures so please check back. For a full list of AM2+ boards that are AM3 compatible checkout our previous motherboard list or there is a full list of compatible AM2+ motherboards on AMD's Web site.