Asus P5N-E SLI - Manual (Page 26)

1-12 Chapter 1: Product introduction
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!
6. Close the load plate (A), then
push the load lever (B) until it
snaps into the retention tab.
A
B
The motherboard supports Intel ® Pentium ® 4 LGA775 processors with
the Intel ® Enhanced Memory 64 Technology (EM64T), Enhanced Intel
SpeedStep ® Technology (EIST), and Hyper-Threading Technology.