Asus M4A78LT - Manual (Page 19)

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 comes with the heatsink package.
You can also refer to section 1.6.2 Installing
heatsink and fan for instructions.
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.
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.
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!
Gold triangle
Small triangle
2. Press the lever sideways to unlock the
socket, then lift it up to a 90°-100° angle.
Socket lever
Ensure that the socket lever is lifted up to a 90°-100°
angle; otherwise, the CPU will not fit in completely.
CPU_FAN
GND CPU
FA
N PWR
CPU
FA
N IN
CPU
FA
N PWM
M4A78LT Series
M4A78LT Series CPU fan connector
ASUS M4A78LT Series 1-9