CPU Socket A motherboard is defined chiefly by what sort of processor it's designed to hold, so that's the most important decision you'll make. Most current motherboards use one of five sockets: the AM3 (or AM3+) and FM1 for AMD CPUs; or the LGA1155 and LGA2011 for Intel CPUs.
In general, the course work in a certificate level program can be completed in 18 to 24 months. CFP Board does not endorse one program over another. All programs cover the same core curriculum, yet vary in style, length and delivery method. They may be certificate programs, undergraduate programs or graduate programs.
I don't know a lot about AAMS, but for $769 and a few hours with an online course I can get the designation. Students are eligible to take the final exam 24 hours after enrollment. CFP requires about a year's worth of coursework and several years of experience.