M4A77T user's manual
Page 20
... heatsink assembly is notched differently to the connector on a DDR2 DIMM socket. DO NOT forget to the module base. A DDR3 module has the same physical dimensions as a DDR2 DIMM but is in place, connect the CPU fan cable to prevent installation on the motherboard labeled CPU_FAN. The figure illustrates the location...
... heatsink assembly is notched differently to the connector on a DDR2 DIMM socket. DO NOT forget to the module base. A DDR3 module has the same physical dimensions as a DDR2 DIMM but is in place, connect the CPU fan cable to prevent installation on the motherboard labeled CPU_FAN. The figure illustrates the location...