Asus P4S-X - Manual (Page 20)

1-10 Chapter 1: Product introduction
1.8 Central Processing Unit (CPU)
1.8.1 Overview
The motherboard comes with a surface mount 478-pin Zero Insertion Force (ZIF)
socket. The socket is designed for the Intel
® Pentium ® 4 Processor in the 478-pin
package with 512/256KB L2 cache on 0.13 micron process. This processor
supports 400MHz front side bus (FSB), and allows a data transfer rate of 3.2GB/s.
Note in the illustration that the CPU has a
gold triangular mark on one corner. This
mark indicates the processor Pin 1 that
should match a specific corner of the
CPU socket.
Gold Mark
Incorrect installation of the CPU into the socket may bend the pins and
severely damage the CPU!