The motherboard you selected supports DDR5 memory only and currently DDR4 was selected. We changed the memory selected to 64GB of DDR5. If you want a system that supports DDR4 memory you must select the other motherboard that supports DDR4 memory. The memory currently selected will be 64GB of DDR5 and the price has been adjusted to reflect these changes. If you want a larger amount of DDR5 memory we also have 128GB DDR5 available to select under the memory section.