Replace RTC Battery - X8400 and X8420
Replace Memory Modules
Replace RTC Battery - X8440
Remove Server Module (Tool-Less) Cover - X8450, X8440
Replace RTC Battery - X8450
Add Memory Modules
Replace CPU and Heatsink (X8420 or X8440 Server Module)
Clear BIOS Passwords Using Jumper
Replace CPU and Heatsink (X8400 Server Module)