Amazon.com: OWC 4GB (2 x 2GB) PC5300 DDR2 667MHz SO-DIMMs Memory Compatible with MacBook, MacBook Pro, iMac, Mac Mini Core 2 Duo Models (OWC5300DDR2S4GP) : Everything Else
SOLVED] - 4gb and 2gb ram installed in computer but only 2gb ram detected | Tom's Hardware Forum
Amazon.com: Waveshare Accessory Compatible with Raspberry Pi 4 Model B 2GB RAM with Powerful Processor Faster Networking Support Dual 4K Output and Different Choice of RAM Comes with a Copper Heat Sink :
Raspberry Pi 4 B: How Much RAM Do You Really Need? | Tom's Hardware
laptop - Can you have PC3L and PC3 RAM together? - Super User
2 X 2GB 12800s RAM sticks - 4GB RAM total - Various Brands - For Laptops 204-Pin 846923007074 | eBay
4GB RAM installed but system shows 2GB installed and usable 1.88GB only | Tom's Hardware Forum
2.2gb Usable out of 4gb RAM. - Windows 10 Forums
Does 64 bit Windows 7 use only up to 4 GB of RAM? What happens with the remaining 2 GB in a 6 GB RAM system? - Quora