Oracle Netra SPARC S7-2, Service Manual, Page: 161 / 258

Locate a Faulty DIMM
When you add or remove DIMMs, follow these rules:
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The server supports 64-GB DDR4-2400 DIMMs, 32-GB DDR4-2400 DIMMs, and 16-GB
DDR4-2400 DIMMs.
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4 DIMMs per CPU or 8 DIMMs per CPU.
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Do not mix DIMM sizes.
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When you add DIMMs in pairs, use DIMMs of the same part number.
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If you are mixing DIMM capacities, install the largest capacities first, then consecutively
smaller capacities.
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Within a memory channel, DIMMs must be populated in the white sockets first, then in the
black sockets.
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If a slot is left empty, install a DIMM filler. With the single-CPU configuration, all DIMM
slots on P 1 must be populated with fillers.
Caution -
Overheating hazard . There must be no empty DIMM slots. Use fillers for empty
slots.
Related Information
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“Install a DIMM” on page 163
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“Locate a Faulty DIMM” on page 161
Locate a Faulty DIMM
1. Gain access to the DIMMs by preparing the server for service and removing the
top cover.
See “Preparing for Service” on page 43 .
Caution -
Follow antistatic practices as described in “Prevent ESD Damage” on page 55 to
avoid component damage. These procedures require that you handle components that are
sensitive to electrostatic discharge. This sensitivity can cause the components to fail.
Caution -
Ensure that all power is removed from the server before removing or installing DDR4
DIMMs, or damage to the DDR4 DIMMs might occur. You must disconnect all power cables
from the system before performing these procedures.
Servicing DIMMs 161