A Raspberry Pi 4 with 16GB? It's been done, but there's a big catch | TechRadar
Raspberry Pi Compute Module 4, CM4, 2GB RAM, 16GB eMMC, BCM2711, ARM Cortex-A72 CM4102016
YouTuber Upgrades Raspberry Pi 4 to 16GB of RAM | Tom's Hardware
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Raspberry Pi Compute Module 4 with WiFi 2GB RAM 16GB Flash - OKdo
Raspberry Pi Compute Module 4 - 2GB RAM 16GB MMC and WiFi : ID 4791 : $45.00 : Adafruit Industries, Unique & fun DIY electronics and kits
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For Raspberry Pi 4 Computer Model B 8GB RAM w/ Official Type-C Power Adapter OM | eBay
Amazon.com: Rock Pi 4 Plus Rockchip RK3399(OP1) Single Board Computer LPDDR4 4GB with WiFi 5 and Bluetooth 5.0 Support Twister OS (4GB RAM+64GB eMMC) : Electronics
Amazon.com: Raspberry Pi 4 Model B 2019 Quad Core 64 Bit WiFi Bluetooth (1GB) : Electronics