The server supports RDIMMs and LRDIMMs. UDIMMs are not supported.
Mixing different types of memory (RDIMMs and LRDIMMs) is not supported.
Mixing 1.5 V and 1.35 V DIMMs in the same server is supported; in such a case, all DIMMs operate at 1.5 V.
The maximum number of ranks per one channel is eight (with the exception of Load Reduced DIMMs, where more than eight ranks are supported, because one
The maximum quantity of DIMMs that can be installed in the server depends on the number of processors installed. The table shows the maximum when all four processors are installed. When two processors are installed, the maximum quantity supported is a half of the quantity that is shown.
All DIMMs in the server operate at the same speed, which is determined as the lowest value of:
Memory speed that is supported by the specific processor.
Lowest of maximum operating speeds for selected memory configuration that depends on rated speed, operating voltage, and quantity of DIMMs per channel, as shown under "Max. operating speed" section in the table.
Table highlighting:
The entries highlighted in red text indicate that the IBM System x3750 M4 supports higher memory frequencies than the Intel processor specification. In some instances, this configuration also results larger memory capacity that the specification recommends.
Tables cells highlighted with a grey background indicate when the specific combination of DIMM voltage and number of DIMMs per channel still allows the DIMMs to operate at rated speed
Table 4. Maximum memory speeds
DIMM specification |
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| LRDIMM | |
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Ranks |
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Part numbers | 49Y1406 (4 GB) | 49Y1559 | 49Y1397 (8 GB) | 90Y3109 (8 GB) | 49Y1567 (16 GB) | ||||
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| (4 GB) | 49Y1563 (16 GB) | 00D4968 (16 GB) | 90Y3105 (32 GB) | |||
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Rated speed | 1333 MHz | 1600 MHz | 1333 MHz | 1600 MHz |
| 1333 MHz | |||
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Rated voltage | 1.35 V | 1.5 V | 1.35 V | 1.5 V |
| 1.35 V | |||
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Operating voltage | 1.35 V | 1.5 V | 1.5 V | 1.35 V | 1.5 V | 1.5 V | 1.35 V | 1.5 V | |
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Max. qty supported* | 48 | 48 | 48 | 48 | 48 | 48 | 48 | 48 | |
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Max. DIMM capacity | 4 GB | 4 GB | 4 GB | 16 GB | 16 GB | 16 GB | 32 GB | 32 GB | |
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Max. mem. capacity | 192 GB | 192 GB | 192 GB | 768 GB | 768 GB | 768 GB | 1.5 TB | 1.5 TB | |
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Max memory at | 128 GB | 128 GB | 128 GB | 512 GB | 768 GB | 512 GB | 1.5 | TB | 1.5 TB |
maximum speed |
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Max operating speed (MHz) |
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1 DIMM per channel | 1333 MHz | 1333 MHz | 1600 MHz | 1333 MHz | 1333 MHz | 1600 MHz | 1333 | MHz | 1333 MHz |
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2 DIMMs per channel | 1333 MHz | 1333 MHz | 1600 MHz | 1333 MHz | 1333 MHz | 1600 MHz | 1333 | MHz | 1333 MHz |
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3 DIMMs per channel | 1066 MHz | 1066 MHz | 1066 MHz | 1066 MHz | 1333 MHz | 1333 MHz | 1333 | MHz | 1333 MHz |
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*Maximum quantity supported is shown for four processors installed. When two processors are installed, the maximum quantity supported is a half of the quantity that is shown. When one processor is installed, the quantity is one quarter of that shown.
IBM System x3750 M4 | 11 |
