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- Description
- Specifications
46W0821 is an 8GB TruDDR4 registered DIMM: single-rank x4 (1Rx4), 1.2V, PC4-19200 CL17 at 2400 MHz, low profile, feature code ATC8.
Lenovo Press lists it in the System x3550 M5 (8869) and x3650 M5 (8871) guides with up to 12 DIMMs on one processor and 24 on two. The x3850 X6 (6241) guide lists it for E7 v4 processors, also supported with E7 v3, at up to 96 DIMMs (24 per CPU), and it is standard in that server's 14x models. The Flex System x240 M5 and NeXtScale nx360 M5 (E5-2600 v4) guides list it too.
In the x3550 M5 with E5-2600 v4 processors, RDIMMs run at 2400 MHz with one or two DIMMs per channel and 1866 MHz with three. With E5-2600 v3 processors, the nx360 M5 guide notes that these 2400 MHz RDIMMs operate at a maximum of 2133 MHz.
The x3550 M5 has 24 DIMM sockets, 12 per processor, across four channels with three DIMMs per channel. Its single-rank x4 organisation matches the 8GB 1Rx4 entry in each of these tables.
The dual-rank 8GB alternative in the same tables is 46W0825 (2Rx8). Need 16GB per slot instead? The dual-rank 46W0829 sits in the same 2400 MHz tables, while 46W0825 is the 2Rx8 8GB option; the IBM System x memory hub lists both.
Fit check: confirm the server is one of the listed System x models and, for the x3850 X6, an E7 v3 or v4 processor.
| 46W0821 Specs | |
| Type | DDR4 RDIMM (TruDDR4), low profile |
| Capacity | 8GB |
| Rank/organisation | 1Rx4 |
| Voltage | 1.2V |
| Speed | PC4-19200 CL17, 2400 MHz |
| Lenovo feature code | ATC8 |
| Servers listed | x3550 M5 (8869); x3650 M5 (8871); x3850 X6 (6241); x240 M5; nx360 M5 |
| Max per server | 24 (x3550 M5, x3650 M5); 96 (x3850 X6) |
| Speed by DPC (x3550 M5, E5-2600 v4) | 2400 / 2400 / 1866 MHz |
| With E5-2600 v3 | up to 2133 MHz |