The OS/2 Version 2.0 installation procedure examines the hardware of the machine to determine the amount of installed memory. Since the recommended minimum memory configuration is 4MB, the installation procedure will indicate an error if less than this amount of memory is present at installation time.
Although 4MB is the minimum memory to start OS/2 V2.0, better performance will be achieved with 6MB or more. This is especially true if the workplace scenario involves running many large or complex applications, or multiple DOS or Windows applications. Some examples of typical user scenarios can be found in OS/2 Version 2.0 - Volume 3: Presentation Manager and Workplace Shell.