Asus P4B266-C - Manual (Page 27)

ASUS P4B266-C motherboard user guide 2-5
2.4.2 Installing the CPU
Follow these steps to install a CPU.
1. Locate the 478-pin ZIF socket on the motherboard.
2. Unlock the socket by pressing the lever sideways, then lift it up to a
90°-100° angle.
Socket Lever
Make sure that the socket lever is lifted up to 90°-100° angle,
otherwise the CPU does not fit in completely.
90 - 100