Found three difference this feature isn't on the regular model.
- ASUS Q-Shield
This is just a labeled I/O back port versus the typical metal one.
Easy and Comfortable Installations
The specially designed ASUS Q-Shield does without the usual "fingers" - making it convenient and easy to install. With better electric conductivity, it ideally protects your motherboard against static electricity and shields it against Electronic Magnetic Interference (EMI).http://www.asus.com/websites/global/products/P48rppKk4jrc9pNd/Q-Shield.jpg
Second is that the Pro has 2 onboard USB 3.0 connectors (4 total ports) and the regular model only has one (2 total) which only matter for front panel connection.
Last is the Pro has four system fan headers and the regular one has three stystem fan headers. The pro doesn't have a TPM connector though which the regular version has.