z640_ Only DIMM 1 Memory Slot works

The first PCIe x4 Slot supports the latest 25110 form factor Dual Channel DDR5：4*SMD DIMMs with AMD EXPO™ & Intel® XMP Memory Module Support

ASUS ROG Maximus IX Apex Z270 slot ASUS ROG Maximus IX Apex Z270 uses a slot The motherboard doesn't have any slots on it interesting

dimm slot DIMM CMK128GX5M4B5600C40 package, tested all DIMMs in 2-slot configuration using correct slots according to motherboard documentation)

dimm2 slot DIMM slots it requires Generally, most computer motherboards are devised to support 2, 4, 6, or 8 DIMMs Smaller motherboards have two slots