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NanoPi R4S Headless SBC Supports Up To 4GB RAM and Features Dual Gigabit Ethernet and USB 3.0 Ports - Electronics-Lab.com
Rock 4 SE 4GB – Single Board Computer 4GB LPDDR4 RAM Rockchip – Oz Robotics
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Orange Pi 3B 4GB RAM DDR4 Rockchip RK3566 Mini PC Board Orange Pi 3 Model B WiFi Bluetooth BLE SBC Single Board Computer - AliExpress
Quartz64 Model B SBC with 4GB RAM is now available for $59.99 - CNX Software
Rock Pi 4C SBC with 4GB RAM, HDMI and DisplayPort Launched for $59 and up - CNX Software
OFFTEK 4GB Replacement Memory RAM Upgrade for AsRock SBC-330 (DDR4-19200) Motherboard Memory at Amazon.com
OKdo ROCK 4 Model SE 4GB Single Board Computer Rockchip RK3399-T ARM Cortex-A72 + Cortex-A53 - OKdo