this model has 128 ram which is the same as mango. I'll pass on this.
[DUAL BAND AC WIRELESS ROUTER] Simultaneous dual band with wireless speed 300Mbps(2.4G)+433Mbps(5G). Tethering, 3G/4G USB Modem Compatible. Convert a public network(wired/wireless) to a private Wi-Fi for secure surfing.
[OPEN SOURCE & PROGRAMMABLE] OpenWrt/LEDE pre-installed, backed by software repository.
[VPN CLIENT & SERVER] OpenVPN and WireGuard pre-installed, compatible with 30+ VPN service providers.
[LARGER STORAGE & EXTENSIBILITY] 128MB RAM, 16MB NOR Flash and 128MB NAND Flash, up to 128GB MicroSD slot, USB 2.0 port, three Gigabit Ethernet ports (1 WAN and 2 LAN).
[PACKAGE CONTENTS] GL-AR750S-Ext (Slate) router with 1-year limited warranty, power adapter, USB cable, Ethernet cable and user manual. Please update to the latest firmware from the following link before using: https://dl.gl-inet.com/firmware/ar750s/release/