ProLiant ML570 Generation 4 Server Maintenance and Service Guide

Removal and replacement procedures 46
NOTE: The ProLiant ML570 G3/G4 memory board operates at different front-side bus speeds:
• In HP ProLiant ML570 Generation 4 Servers, the G3/G4 memory board operates at 800-
MHz. The HP ProLiant ML570 Generation 4 server only supports 800-MHz processors and
the memory board operates at the speed of the supported processors.
• In HP ProLiant ML570 Generation 3 Servers, the G3/G4 memory board operates at 667-
MHz with no performance gain over ProLiant ML570 G3 memory boards.
IMPORTANT: Installing a ProLiant ML570 G3 memory board in an HP ProLiant ML570 G4
Server forces the front-side bus speed to 667 MHz. If the installed processor has an 800-MHz
front-side bus, a message displays at POST.
IMPORTANT: The HP ProLiant ML570 G4 Server does not support hot-add of ProLiant ML570
G3 memory boards. Inserting the memory board generates an audio alert and the memory
board LEDs flash. The memory board does not power up. The board can be removed without
powering down the server.
Memory board and DIMM installation, removal, and replacement procedures can be either hot-plug or
non-hot-plug, depending on how the server is configured. Hot-plug operations can be hot-add or hot-
replace. Hot-add makes additional memory resources available to the OS. Hot-replace allows failed or
degraded DIMMs to be replaced while the server is running. Hot-add is only supported with Microsoft®
Windows Server™ or later. Hot-replace has no OS requirements.
The following table illustrates AMP modes that support hot-plug features.
Advanced Memory
Protection Mode
Hot-
Replace
Supported
Hot-Add
Supported
Advanced ECC X
Online Spare Memory
Hot-Plug Mirrored Memory X
Hot-Plug RAID Memory X
When the server is configured for mirrored or RAID memory, you can perform a hot-replacement
procedure in the following manner without powering down the server or experiencing server downtime:
1. Remove a memory board.
2. Replace failed or degraded DIMM(s).
3. Reinstall the memory board in the slot from which it was removed.
The replacement procedures in this section apply to both hot-plug and non-hot-plug memory procedures,
except as noted.
IMPORTANT: Be sure to power down the server when performing board removal procedures
in a server that is not configured for Mirrored or Hot-Plug RAID Memory.
Observe the following warnings when performing a hot-plug replacement procedure.
WARNING: Always comply with all electrostatic and thermal guidelines to prevent bodily
injury and ensure a properly functioning system when performing hot-plug operations.