The two editions (standard and pro) are identical except for the following additional Pro edition features.
Serial port loop backtesting. Testing can be performed on up to 12 serial ports at the same time. Loopback plugs are required for this test. Parallel port loop backtesting. Loopback plugs are required for this test. USB port testing using the PassMark USB Loopback plug or the PassMark USB 2.0 Loopback plug. Up to 10 USB ports can be simultaneously tested. CPU affinity selection, for targeting testing to a single CPU. This can be useful in dual CPU or quad CPU systems. Advanced RAM testing with page locking and testing beyond the 4GB barrier in Windows 2000 and XP. (up to 64GB) Scrolling 'H's for Electromagnetic Compliance (EMC) testing to ANSI standard C63.4-1992 Additional options for video card testing