Can you mix 2Rx8 and 1Rx8 RAM?

Yes, you can mix 2Rx8 and 1Rx8 RAM modules, but there are some considerations. The system will typically run both modules at the speed of the slower one, and the total available memory will be reduced if the modules are of different capacities. Additionally, using RAM from the same manufacturer and with similar specifications is recommended to ensure compatibility and stability. Always check your motherboard's specifications for supported configurations.