Nintendo Switch OLED development kit has an extra 2 GB of RAM : r/nintendo
Nintendo Switch OLED Will Not Come With A New CPU Or Increased RAM
Nintendo Switch hardware update coming with new processors, more RAM? | Trusted Reviews
Nintendo Switch to Reportedly Include 4GB of RAM - Nintendo Life
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. :
New Switch mod delivers real-time CPU, GPU and thermal monitoring - and the results are remarkable • Eurogamer.net