Position the CPU above the socket Asus prime Asus M3A78-EH

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ASUS M3A78-EH

1-11

3.  Position the CPU above the socket 

such that the CPU corner with the 

gold triangle matches the  socket 

corner with a small triangle.

4.  Carefully insert the CPU into the 

socket until it fits in place.

5.  When the CPU is in place, push 

down the socket lever to secure the 

CPU. The lever clicks on the side 

tab to indicate that it is locked.

6.  Install a CPU heatsink and fan 

following the instructions that came 

with the heatsink package.

Gold triangle

Small triangle

The CPU fits only in one correct orientation. DO NOT force the CPU into the 

socket to prevent bending the pins and damaging the CPU!

7.  Connect the CPU fan cable to the CPU_FAN connector on the motherboard.

Do not forget to connect the CPU fan connector! Hardware monitoring errors 

can occur if you fail to plug this connector.

R

M3A78-EH

M3A78-EH CPU Fan Connector

CPU_FAN

GN

D

CPU 

FA

N PW

R

CPU 

FA

N IN

CPU 

FA

N PW

M