Some legacy applications including pre 11 Oracle COTS software only run on 32 bit. Keep this in mind when moving a 32 bit based application to EC2: These are the instance types that support 32 bit:
- m1.small : Memory 1.7 GB CPU : 1
- m1.medium : Memory 3.75 CPU : 2
- c1.medium : Memory 1.7 GB CPU : 5 ECU
- t1.micro : Memory .615 GB CPU: 1 ECU variable
ON Windows, WoW64 on Windows Server x64 can be used to run a 32 bit application.