Digital Foundry says the dev unit for the OLED Switch comes with 8GB of RAM, while the dev unit for the regular Switch came with 6GB. All retail units still with 4GB. :
ANBERNIC RG552 144GB 15000+ Games LPDDR4 4GB RAM Android 7.1 Linux WiFi Online Retro Handheld Video Game Console Tablet for PSP PS1 WII NGC NDS N64 DC 5.36 Inch IPS Screen | Alexnld.com
Nintendo Switch may use 4GB LPDDR4 1600MHz RAM | TweakTown
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Amazon.com: Nintendo Switch with Neon Blue and Neon Red Joy‑Con - HAC-001(-01) + SanDisk 128GB MicroSDXC UHS-I Card : Video Games
Nintendo Switch may use 4GB LPDDR4 1600MHz RAM | TweakTown
Emily Rogers Says That Nintendo Switch Has 4GB Of Ram In Retail Units - My Nintendo News
Yuzu, the Nintendo Switch Emulator, Just Got Updated to Use 50% Less RAM
Nintendo Switch internal memory was upped at Capcom's request | TechnoBuffalo
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Nintendo Switch internal memory was upped at Capcom's request | TechnoBuffalo
Nintendo Switch may use 4GB LPDDR4 1600MHz RAM | TweakTown
Nintendo Switch Confirmed 4GB RAM - Nintendo Never Learns - Another Underpowered Console - YouTube
Amazon.com: Android 10.0 TV Box, EASYTONE Android TV Box 4GB Ram 32GB ROM Allwinner H616 Quad-Core Support Dual WiFi 2.4G+5G Bluetooth 4K 6K Ultra HD H.265 3D Smart Media Player : Electronics
Emily Rogers says that the Switch has 4GB of RAM in the retail units, double the Wii U's RAM. : r/NintendoSwitch
Nintendo Switch - 4GB of Ram CAN Do Multiplatform Games - YouTube