Two RAM sticks into a four DIMM slot motherboard which slots?

x299 dark not recognizing all 4 dimm slots dimm slot An ASUS TUF with so-dimm memory slot! This is a full-size ATX board that is equipped with regular DIMM slots dimm 2 slot Figure showing DIMM removal from the DIMM slot Lift the DIMM and set it The workstation contains six DIMM slots divided into three channels (two slots per

dimm slot MSI 7883-001R Computer Dimm Lga 2011-3 Motherboard X99A Godlike Gaming Carbon, e atx MSI PRO B760M-P Motherboard, Micro-ATX