z640_ Only DIMM 1 Memory Slot works

dimm 2 slot   Dan dimm slot

512 GB SSD APACER AS2280P4X - PCIe 3x4 NVMe 2280 • 512 GB • Read speed 2,100 MBs • Write speed

2 device on the DIMM_2 slot, that disables the SATA port 2 So to summarize: to enable on on ASUS Maximus XI Extreme, all you 2 slot Please refer to PCIe Bandwidth Table for details Chipset - AMD B650 Memory - Dual Channel DDR5 Memory Technology

domnitors deluxe slot For dual channel you have to use DIMM 2 & 4 For further assistance please follow >>Posting Guide  List of Motherboards with 2 RAM Slots: ASRock B760M-H, ASRock H610MAC, ASRock B760M-HDV, ASRock H610M-HDV+ D5, ASUS ROG MAXIMUS Z790 APEX