add more ram slots to motherboard

I'm trying to get 4 ram slots to work on my Asus motherboard (Asus ROG Strix Z790-E Gaming Wifi). But I'm having problems with getting more than 2 ram sticks to work. First off, I noticed that two ram sticks won't work until I use 1 ram stick and turn on my PC. Then two ram sticks will work after th...

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Hence, people often ask how to add more M.2 SSD slots or a second SSD if their motherboard only has a single M.2 slot. ... These PCIe expansion cards can feature 1-4 M.2 slots for NVMe SSDs.