Windows: Press Ctrl + Shift + Esc, open Task Manager, go to Performance > Memory
Windows: Press Win + R, type msinfo32, and check Installed Physical Memory
Windows: Open Command Prompt and run wmic memorychip get capacity, speed, manufacturer, partnumber
Windows: Open PowerShell and run Get-CimInstance Win32_PhysicalMemory | Format-Table Manufacturer, PartNumber, Capacity, Speed
Mac: Click the Apple menu, select About This Mac, and check Memory
Mac: Open System Information and check Memory under Hardware
Linux: Open a terminal and run free -h
Linux: Open a terminal and run sudo dmidecode -t memory
Linux: Open a terminal and run lshw -short -C memory
Check your motherboard or laptop model specifications for supported RAM type and maximum capacity
Open your PC case or laptop service panel and read the RAM label on the module