Gigabyte GA-X Series Motherboard Memory Upgrade Configurator - choose your Model:

GA-X38-DQ6
GA-X38-DS4
GA-X38-DS5
GA-X38T-DQ6
GA-X48-DQ6
GA-X48-DS4 (rev 1.3)
GA-X48-DS5
GA-X48T-DQ6
GA-X58-UD3R-SLI
GA-X58-USB3
GA-X58A-UD3R
GA-X58A-UD5
GA-X58A-UD7
GA-X58A-UD9