Intel-based CoMs feature soldered RAM for high shock/vibration resistance
Engineers Upgrade Soldered Components on Apple M1 Mac Mini | TechPowerUp
X1 Extreme Expansion Opportunities - No Soldered RAM in this X1 - Every single X1 Extreme will accept 4TB NVMe + 64GB DDR4 RAM whenever you are ready regardless of what it
Teardown of Retina MacBook Pro finds soldered RAM, proprietary SSD | AppleInsider
You Can't Upgrade Soldered-On Laptop RAM? Think Again | Hackaday
How to upgrade RAM in your Lenovo ThinkPad T490 | Windows Central
The internals of the T14 AMD, only one ssd storage and one soldered ram, but have a microSD slot : r/thinkpad