IBM eServer 350 xSeries Installation Manual page 22

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To install a memory module:
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IBM xSeries 350: Installation Guide
All the DIMMs installed in a bank must be the same size, speed, type, and
technology. You can mix compatible DIMMs from various manufacturers.
All the banks do not have to contain DIMMs of the same size, speed, type, and
technology. You can mix compatible DIMMs from various manufacturers.
The memory board contains 16 DIMM connectors and supports 4-way memory
interleaving.
To use the 4-way memory interleaving technology in your server, you must install
DIMMs in all four connectors in each populated bank.
Install only 3.3 V, 168-pin, 8-byte, 100 MHz, PCI, PC100-322-622R, registered
synchronous dynamic random-access memory (SDRAM) DIMMs with error
correcting code (ECC). Only 100 MHz, 72-bit, registered, synchronous DIMM
memory is supported for the 128 MB, 256 MB, 512 MB, and 1 GB DIMMs.
Installing or removing DIMMs changes the configuration information in the
server. Therefore, after installing or removing a DIMM, you must save the new
configuration information using the Configuration/Setup Utility program. See
the User's Reference on the xSeries Documentation CD for more information.
Review the information in "Safety" on page v.
Turn off the server and remove the power cords.
Remove the top cover.
Remove the memory-board assembly from the server.
Select the connectors in which you want to install the DIMMs.
Install the DIMMs in the connectors.
Error LEDs
Memory slot 5
Replace the memory-board assembly in the server.
Install the top cover.
Connect all cables and power cords.
Memory slot 1
Memory slot 13
Memory slot 9
Error LEDs