Lenovo ThinkStation P620 Hardware Maintenance Manual page 105

Your computer has eight slots for installing DDR4 RDIMMs that provide up to a maximum of 512 GB system
memory. When removing or installing a memory module, use the following guidelines:
• Use 16 GB, 32 GB, or 64 GB DDR4 ECC RDIMMs in any combination up to a maximum of 512 GB.
• Ensure that you follow the installation order for memory modules shown in the following table.
Memory modules
one
two
Four
Eight
For access, do the following:
1. Remove the computer cover. See "Computer cover" on page 58.
2. Lay the computer on its side for easier access to the system board.
3. Remove the memory cooler and duct. See "Memory module active cooler and duct" on page 100.
Replacement steps
Installation order
Slot 7
Slot 7 and slot 8
Slot 7, slot 8, slot 2, and slot 1
Slot 1 to slot 8
.
Chapter 7 Hardware removal and installation
101