AMD just sent a note to me this afternoon letting me know the "configurator" for AMD recommended motherboards has been updated to include the newly-released CPUs. If you've never checked out the configurator you can plug in your CPU and it will give you some AMD Recommended Motherboards: http://products.amd.com/en-us/RecommendedMBFilter.aspx
Then results for Phenom II X4 955 matches these motherboards:
15 Matching Products
Chipset Motherboard Revision Form Factor Socket
AMD 790GX Asus M3A78-T 1.01G ATX AM2+
AMD 790GX MSI DKA790GX Platinum (MS-7550) 1.0 ATX AM2+
AMD 790GX Gigabyte GA-MA790GP-DS4H 0.2 ATX AM2+
AMD 790GX ECS A790GXM-A (RS780DM-A) 1.0 ATX AM2+
AMD 790FX Asus M3A79-T Deluxe 1.01G ATX AM2+
AMD 780G ECS A780GM-A Ultra (RS780M-A2) 1.0 ATX AM2+
AMD 780G Gigabyte GA-MA78GM-S2HP 2.0 uATX AM2+
AMD 780G MSI KA780GM (MS-7552) 1.0 uATX AM2+
AMD 790GX MSI 790GX-G65 (MS-7576) 1.0 ATX AM3
AMD 790FX Asus M4A79-T Deluxe 1.01G ATX AM3
AMD 790GX ECS A790GXM-AD3 1.0 ATX AM3
AMD 790FX Gigabyte GA-MA790FXT-UD5P 1.0 ATX AM3
AMD 790X Gigabyte GA-MA790XT-UD4P 1.0 ATX AM3
AMD 790FX MSI 790FX-GD70 (MS-7577) 1.0 ATX AM3
AMD 790GX Biostar TA790GX A3+ 5.0 ATX AM3