You may want to learn a little more about data units...
It has 6 gigabit per second SATA connectors. SATA is the interface between your motherboard and your HDD/SSD/ODD.
For RAM, it supports "4 x DIMM, Max. 32GB, DDR3 2133(O.C.)/1866/1600/1333/1066 MHz ECC, Non-ECC, Un-buffered Memory".
You're probably running a 32bit OS.