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R4S29A is the HPE Superdome Flex 280 128GB (1x128GB) Quad Rank x4 DDR4-3200 Load Reduced Standard Memory Kit. Spare number P39528-001 is the 128GB DDR4-3200 LRDIMM, 4R, 16Gx4.
The Superdome Flex 280 takes five DIMM types: 32GB and 64GB 2Rx4 DDR4-3200 registered DIMMs, 64GB 4Rx4 DDR4-2933 load reduced DIMMs, this 128GB 4Rx4 DDR4-3200 load reduced DIMM, and a 256GB 8Rx4 DDR4-3200 load reduced DIMM. Each chassis has 48 DIMM slots, twelve per socket, and the system scales from two to eight sockets.
The 128GB LRDIMM runs at 3200 MT/s with 1, 4 or 6 DIMMs per socket. Four modules reach 512GB per socket, which is 1TB in a two-socket system and 4TB in an eight-socket system; six modules reach 768GB per socket, or 6TB across eight sockets. Filling all twelve slots per socket drops the data rate to 2933 MT/s.
64GB and 128GB load reduced DIMMs can be mixed, provided each socket is populated with half of each size.
| Designation | HPE Superdome Flex 280 128GB (1x128GB) Quad Rank x4 DDR4-3200 Load Reduced Standard Memory Kit |
| Part number | R4S29A |
| Spare number | P39528-001 |
| Capacity | 128GB (1 x 128GB) |
| Type | DDR4 load reduced DIMM (LRDIMM), 4Rx4 |
| Data rate | DDR4-3200 |
| Speed with 1, 4 or 6 DIMMs per socket | 3200 MT/s |
| Speed with 12 DIMMs per socket | 2933 MT/s |
| Platform | HPE Superdome Flex 280 |
| DIMM slots per chassis | 48 |