IBM PS/2 65 SX Hardware Maintenance Reference page 29

IBM PS/2 Model 65 SX HMR
Memory Requirements and Limitations
3.3.3 Memory Requirements and Limitations
The system board does not have to be fully populated before
memory-expansion adapters can be installed, and a memory-expansion adapter
does not have to filled to capacity before another memory-expansion
adapter can be installed.
When memory is added or removed from the system, run the set configuration
program on the Reference Diskette.
3.3.3 - 1