Quote Originally Posted by GoldenTiger View Post
P8P67 NON-pro only supports CF, and has one x16 slot that runs full-speed. When the second slot is populated for crossfire it goes down to x4 or x1 mode (x4 if no other devices are in use except the two video cards, x1 otherwise) while the main slot goes to x8.

The P8P67 PRO has SLI and CF support with x8/x8 in the two slots for those setups (i.e. the crippled performance of the NON-pro model in CF/dual card config isn't the case on the PRO). Additionally it features an Intel NIC vs. the Realtek one of the NON-pro, and better phase regulation as well as a bunch of other more minor features/niceties of the board.

Definitely go for the Pro if you can... if you NEVER intend to try a multi-card config, the non-pro could be viable, but it is an inferior board.
The PRO would be the perfect P67 board if it had power and reset buttons, but unfortunately you have to shell out an extra $20 for them on the EVO (the only other thing you get is dual-LAN, which at least for me is not that useful).