AMD fastest DeskTop system with socket AM4 AM3 plus CPUs
AMD AM4, AMD AM3+ CPU, AMD Radeon Graphics , based on ASUS /ASROCK mainboards and ASUS graphic cards, a great altenative solution (to intel / NVIDIA)
AM4 Ryzen CPUs are new (announced 2/03/2017), very competitive , with a brand new architecure
AM4 Ryzem mainboards support M.2 SSDs (PCIe 3.0 x4, and SATA III)
Finally AM4 Ryzen CPUs support DDR4 memory, ( only DDR4)
AM3 + CPUs are simply very old !