According to Speccy, this mobo has four RAM slots. According to BioStar (http://www.biostar-usa.com/app/en-us/mb/introduction.php?S_ID=558#specification), and my own visual inspection, it has two RAM slots. I've reported this before, after I relied on Speccy to justify the purchase additional RAM. Fortunately, I have another mobo that may be able to use the memory.
SS-AMD55-170420.speccy
SS-AMD55-180704.speccy