OpenLink provides direct support for 3.x/4.x RISC6000, 4.3 RISC6000, and 4.2 PowerPC. Additionally, AIX 4.2 components function on AIX 4.3 systems. AIX 3.x/4.x components should function on many AIX 4.3 systems. (The reverse is not true, in either case.)  

If you are in doubt about your needs, submit the output of a uname -a to OpenLink Product Support. Support will determine the best fit for your platform.