Asus P8B-X - 2.2.1 Placement direction; 2.2.2 Screw holes

R1.0x (Z9s) R2.0x (AST1100)
How to differentiate the motherboard
PCBA revision location
* B06 or earlier PCBA revision indicate R1.0x
** After September 2011, we will be shipping R2.0x, the PCBA revision will be C03 or above