Memory Options; Advanced Ecc Memory; Installing Dimms - HP ProLiant DL785 User Manual

12. Install the processor memory cell into the server.
13. Power up the server.

Memory options

Each processor memory cell can hold two to eight DIMMs. At least one pair of DIMMs must be
installed in slots 1A and 2A on each processor memory cell to operate the server. The following
DDR2 667-MHz DIMM sizes are supported:
• 1 GB
• 2 GB
• 4 GB
• 8 GB
Number of processors
4
8

Advanced ECC memory

Advanced ECC memory is the default memory protection mode for this server. In Advanced
ECC, the server is protected against correctable memory errors. The server notifies you if the
level of correctable errors exceeds a predefined threshold rate. The server does not fail because
of correctable memory errors. Advanced ECC provides additional protection over Standard ECC
because it is can correct certain memory errors that are otherwise be uncorrectable and result in
a server failure.
Where Standard ECC can correct single-bit memory errors, Advanced ECC can correct single-bit
memory errors and multi-bit memory errors if all failed bits are on the same DRAM device on
the DIMM.

Installing DIMMS

To add additional memory to the server observe the following DIMM installation guidelines:
• DIMMs must be installed in pairs.
• DIMM installed on the same memory bank (DIMM pairs) must have the same part number.
• DIMMs installed in different banks can be of different sizes.
• A minimum of two DIMMs must be installed per processor memory cell.
• DIMM pairs must be installed evenly across processor memory cells.
• DIMMs must be installed in decreasing capacity with the largest DIMMs installed in the
banks furthest away from each processor.
NOTE:
speed will be 533 MHz. If two or fewer banks on a memory node are populated, the maximum
memory clock speed will be 677 MHz.
To install a DIMM:
1. Power down the server
2. Remove the processor memory cell and airflow baffle
cell and airflow baffle" (page
3. Open the DIMM slot latches.
4. Remove the DIMM slot filler.
46 Hardware options installations
Minimum memory
8 GB (eight 1-GB DIMMS)
16 GB (16 1-GB DIMMS)
If all four banks on a memory node are populated, the maximum memory clock
("Power down the server" (page
39)).
Maximum memory
256 GB (32 8-GB DIMMS)
512 GB (64 8-GB DIMMS)
31)).
("Removing the processor memory