Asus SABERTOOTH 990FX - Manual (Page 48)

2-30 Chapter 2: Hardware information
Chapter 2
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2.3.2 CPU installation
The AMD AM3+ socket is compatible with AMD AM3+ and AM3 processors. Ensure you
use a CPU designed for the AM3+ socket. The CPU fits in only one correct orientation. DO
NOT force the CPU into the socket to prevent bending the connectors on the socket and
damaging the CPU!