The A7A266 is based on the ALI Magik chipset, and the A7M266 is based on the AMD 760 chipset. The A7A has 2 DDR dimm slots AND 3 SDRAM slots. The A7M266 only has the 2 DDR slots. I do believe the A7M was recalled by Asus, but if i were you i'd go with the A7A266, my friend has it and has had no problems at all.