A:AnswerYes it will. This motherboard supports up to 4. One slot is under a heat sink plate. Two more are underneath that. An there’s one on the lower right side of the motherboard.
A:AnswerNo. They are not interchangeable. DDR4 and DDR5 boards can only accept the specific modules that they are designed for. There are significant electrical and architectural differences between the two technologies that make them incompatible with one another.