Chapter 3: Maintenance and Component Installation
39
Guidelines Regarding Mixing DIMMs
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All DIMMs must be DDR4 or a mixture of PMem and DDR4.
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x4 and x8 DIMMs can be mixed in the same channel.
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Mixing of LRDIMMs and RDIMMs is not allowed in the same channel, across different
channels, and across different sockets.
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Mixing of non-3DS and 3DS LRDIMM is not allowed in the same channel, across different
channels, and across different sockets.
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Mixing of PMem modules and RDIMMs is supported
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Mixing DDR4 and PMem memory operating frequencies is not validated within a socket or
across sockets. If DIMMs of different frequencies are mixed in the same channel, all DIMs
will run at the highest common frequency.
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Always populate the DIMM with the higher electrical loading on a channel in DIMMx1 (farther
from CPU) followed by DIMMx2.