v The memory rank sparing feature is supported on server models with an IntelXeon ™ E5-2600 series microprocessor.v The maximum available memory is reduced when memory rank sparing mode isenabled.The following diagram lists the DIMM connectors on each memory channel.Follow the installation sequence for rank sparing mode:v Install at least one quad-rank DIMM in a channel.v Install at least two single-rank or dual-rank DIMMs in a channel.Table 9. Memory rank sparing mode DIMM population sequenceNumber of DIMMsNumber of installedmicroprocessor DIMM connectorFirst pair of DIMMs 1 1, 2Second pair of DIMMs 1 4, 5Third pair of DIMMs 1 8, 9Fourth pair of DIMMs 1 11, 12Fifth pair of DIMMs 1 7, 10Sixth pair of DIMMs 1 3, 6Seventh pair of DIMMs 2 13, 14Eighth pair of DIMMs 2 16, 17Ninth pair of DIMMs 2 20, 21Tenth pair of DIMMs 2 23, 24Eleventh pair of DIMMs 2 19, 22Twelfth pair of DIMMs 2 15, 18Note: DIMM connectors 3, 6, 7, 10, 15, 18, 19, and 22 are not used in memory ranksparing mode when UDIMMs are installed in the server.Installing a DIMMTo install a DIMM, complete the following steps:1. Read the safety information that begins on page vii and “Installation guidelines”on page 38.2. Turn off the server and peripheral devices and disconnect the power cords andall external cables, if necessary.3. Remove the cover (see “Removing the cover” on page 50).4. Remove the air baffle (see “Removing the air baffle” on page 51).5. Open the retaining clip on each end of the DIMM connector.Attention: To avoid breaking the retaining clips or damaging the DIMMconnectors, open and close the clips gently.Figure 2. Connectors on each memory channel64 IBM System x3550 M4 Type 7914: Installation and User’s Guide
