Asus Crosshair V Formula/ThunderBolt - Manual (Page 64)

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2.3.2. CPU.installation
The AM3+ socket has a different pinout from the AM2+/AM2 socket. 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!
2-34 Chapter 2: Hardware information