HP DL120

Hardware options installation 27
Hardware options installation
Introduction
If more than one option is being installed, read the installation instructions for all the hardware options and
identify similar steps to streamline the installation process.
WARNING: To reduce the risk of personal injury from hot surfaces, allow the drives and the
internal system components to cool before touching them.
CAUTION: To prevent damage to electrical components, properly ground the server before
beginning any installation procedure. Improper grounding can cause electrostatic discharge.
Memory options
The server memory subsystem supports only UDIMMs.
The server supports single- and dual-rank PC3-10600E (DDR3) DIMMs operating at a speed of 1,333 MHz.
Depending on the processor model and the number of DIMMs installed, the memory clock speed might be
reduced to 1,066 or 800 MHz. For more information, see "General DIMM slot population guidelines (on
page 29)."
Memory subsystem architecture
The memory subsystem in this server is divided into channels. The processor supports two channels, and each
channel supports two DIMM slots, as shown in the following table.
Channel Slot Slot number
A
C
A
1
2
B
D
B
3
4
This server supports only UDIMMs.
DIMM slots in this server are identified by number and by letter. Letters identify the slots to populate for
specific memory modes. Slot numbers are reported by ROM messages during boot and for error reporting.
Single- and dual-rank DIMMs
DIMM configuration requirements are based on these classifications:
• Single-rank DIMM−One set of memory chips that is accessed while writing to or reading from the
memory.
• Dual-rank DIMM−Two single-rank DIMMs on the same module, with only one rank accessible at a time.