ONE OF THE MANY. I need help too!

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The 770 chipset is fairly new. I would be surprised if the GA-MA770-UD3 didn't work out of the box. It would still be a good idea to upgrade the BIOS after you get the system going, though. The GA-MA770UD3 doesn't technically support the Phenom II X2 545 until BIOS F6 released on 07/31/09, but I still think it should be fine.

http://www.gigabyte.us/Support/Motherboard/CPUSupport_Model.aspx?ProductID=2978

http://www.gigabyte.us/Support/Motherboard/BIOS_Model.aspx?ProductID=2978#anchor_os

The Asus M3A76-CM is a micro-ATX board, but supports the CPU with an earlier BIOS (BIOS 0602 released on 04/14/09).

http://usa.asus.com/product.aspx?P_ID=aU8effdifLvraVze&templete=2
 
I just want to thank everyone for helping me. I got the build running flawlessly with an HD 4850. Runs better than I imagined.