so I have amd phenom x2 550 and I need new motherboard because this old mother board supports am2 but not am2+. So I find gigabyte GA-MA74GM-S2 motherboard My question is that can I use amd phenom x2 550 on GA-MA74GM-S2 motherboard.
With the model number and revision of the motherboard, you can go to Gigabyte's support site to verify CPU compatibility. Just google the model number to get you started.