Hardware options installation 29
DIMM installation guidelines
Observe the following guidelines when installing additional memory:
• DIMMs installed in the server must be unbuffered DDR2 SDRAM, 2.5 V, 64 bits wide, and ECC.
• All DIMMs installed must be the same speed (DDR2 PC5300). Do not install DIMMs supporting
different speeds.
• If only a single DIMM is installed, HP recommends installing it in slot 1A.
BIOS detects the DIMM population and sets the system as follows:
• Single-bank mode: DIMMs installed in one bank only.
• Dual-bank interleaved mode: DIMMs installed in both banks with equal bank capacities.
The following table lists some, but not all, possible configurations. For best performance, HP recommends
dual-bank interleaved mode configurations.
Slot 1A Slot 2B Slot 3A Slot 4B Total memory Mode
512 MB — — — 512 MB Single-bank
512 MB — 512 MB — 1 GB Dual-bank interleaved
1 GB — — — 1 GB Single-bank
1 GB — 1 GB — 2 GB Dual-bank interleaved
1 GB 1 GB 1 GB 1 GB 4 GB Dual-bank interleaved
Installing DIMMs
1. Power down the server (on page 16).
2. Remove the server from the rack (on page 17).
3. Remove the access panel (on page 17).
4. Open the DIMM slot latches.
5. Install the DIMM.
6. Install the access panel.
7. Install the server into the rack.
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