1.5.4 Layout contents
1.6 Central Processing Unit (CPU)
This motherboard comes with an AM3 socket designed for Phenom™ II / Athlon™ II /
Sempron™ 100 series processors.
1.6.1 Installing the CPU
To install a CPU:
1. Locate the CPU socket on the motherboard.
The AM3 socket has a different pinout from the AM2+/AM2 socket. Ensure that you use a
CPU designed for the AM3 socket. The CPU ts in only one correct orientation. DO NOT
force the CPU into the socket to prevent bending the pins and damaging the CPU!
M4A78LT Series
M4A78LT Series CPU socket AM3
Connectors/Jumpers/Slots Page Connectors/Jumpers/Slots Page
1. USB device wake-up (3-pin USBPW1-4,
USBPW5-10)
1-20 8. IDE connector (40-1 pin PRI_IDE) 1-24
2. ATX power connectors (24-pin EATXPWR, 4-pin
ATX12V)
1-23 9. Onboard LED 1-5
3. Keyboard power (3-pin KBPWR) 1-20 10. System panel connector (20-8 pin PANEL) 1-26
4. CPU and chassis fan connectors (4-pin
CPU_FAN, 3-pin CHA_FAN)
1-28 11. USB connectors (10-1 pin USB56, USB78,
USB910)
1-27
5. AMD CPU socket 1-8 12. Clear RTC RAM (CLRTC) 1-19
6. DDR3 DIMM sockets 1-11 13. Digital audio connector (4-1 pin SPDIF_OUT) 1-27
7. Serial ATA connectors (7-pin SATA1-6) 1-25 14. Front panel audio connector (10-1 pin AAFP) 1-22
Chapter 1: Product introduction1-8
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