User Manual - Page 23
DIMM_A1 DIMM_A2 DIMM_B1 DIMM_B2
Chapter 2
2.2.3 System memory
The motherboard comes with four Double Data Rate 3 (DDR3) Dual Inline Memory Modules (DIMM) slots.
A DDR3 module is notched differently from a DDR or DDR2 module. DO NOT install a DDR or DDR2 memory module to the DDR3 slot.
P8H77-M PRO
P8H77-M PRO 240-pin DDR3 DIMM sockets
Recommended memory configurations
We recommend that you install the memory modules from the blue slots for better overclocking capability.
ASUS P8H77-M PRO
2-5