4 slots ram
HP 8540W with Nvidia Quadro K2100M - bios-mods.com
Laptop model: HP Elitebook 8540W Quadcore (mainboard with 4 ram slots) Working GPU: Nvidia Quadro FX880M.
Mainboard Asus ROG MAXIMUS Z790 FORMULA DDR5
Loại RAM, DDR5 ; Kết nối ; Bus RAM hỗ trợ, 4 x DIMM slots, DDR5, ECC Registered Memory 4 Channel Memory Architecture
Why does my Task Manager show i have 4 open RAM slots? — Acer ...
You don't. Its likely the chipset which is common to other designs supports 4 ram slots. There's only 2 physical ram slots its entirely possible to use the same chipset for 4 sticks.