ASRock P4 Combo User Manual - Page 12

2.2 CPU Installation This motherboard is equipped with two types of CPU sockets. You may choose to install either Intel 775-Pin CPU or Intel 478-Pin CPU into this motherboard. However, to avoid instability and damage to the system, please do not install both of them into this motherboard. I. For the installation of Intel 775-Pin CPU, please follow the steps below. 775-Pin Socket Overview Before you insert the 775-Pin CPU into the socket, please check if the CPU surface is unclean or if there is any bent pin on the socket. Do not force to insert the CPU into the socket if above situation is found. Otherwise, the CPU will be seriously damaged. Step 1. Open the socket: Step 1-1. Disengaging the lever by depressing down and out on the hook to clear retention tab. Step 1-2. Rotate the load lever to fully open position at approximately 135 degrees. Step 1-3. Rotate the load plate to fully open position at approximately 100 degrees. 12