Gigabyte x58-Extreme (F13s bios) Memory Slot (Disappearing / dead) Problem

[alicanyildiz]

Hello to everyone.
The 1st and 3rd slots are working. but the RAMs installed in other slots see the system but are not active.
I have updated the latest BIOS version. I researched. but I could not find a solution. processor pins are solid. motherboard socket pins are solid.

Disappearing RAM on X58 Motherboards

[alicanyildiz]

[shadowsports]

A couple of recommendations / observations.

RAM should always be installed in matched sets (unless its single channel).  This means same brand, size, timings, etc

The processor you choose can affect memory support

Best results are achieved when you use RAM listed on the QVL for your board

Your board supports Dual/Triple channel, so you should install 2 like DIMMs for dual channel or 3 like DIMMs for triple channel