AMD CPUs have an embedded memory controller, meaning that it is the processor, not the chipset, that defines what memory technologies and the maximum amount of memory you can have. The motherboard, however, may have a limitation as to how much memory can be installed.
The integrated memory controller from socket FM1 processors supports DDR3 memories up to 1,866 MHz under dual-channel architecture. However, Biostar says the TA75A+ supports memory up to 2,000 MHz through overclocking.
The Biostar TA75A+ has four memory sockets, and since DDR3 memory modules can now be found in capacities up to 8 GB, you can have up to 32 GB with this motherboard if you use four 8 GB modules.
The first and third sockets are red, while the second and fourth are white. In order to achieve the maximum performance, you should install two or four memory modules in order to enable dual-channel architecture. When only two modules are used, install them in the red sockets.