SK hynix HMA42GR7AFR4N-TF 16GB DDR4 2133MHz CL15 ECC Registered Dual Rank 1.2V 288-Pin Server RAM
- 16GB
- 288-Pin DDR4 SDRAM
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Brute Networks
16GB DDR4-2666 ECC UDIMM for Lenovo servers, 2Rx8 1.2V validated compatible
This 16GB DDR4 2666 ECC UDIMM module is built for servers and workstations that require error-correcting memory. It runs at 1.20V with a 2Rx8 rank configuration on a 288-pin interface. The part is validated as a direct replacement for Lenovo part number 4X70S69156.
Replaces standard unbuffered memory without error correction or smaller 8GB modules when data integrity is required. The jump is worth it when workloads demand ECC protection and the platform supports DDR4 2666 speeds at PC4 21300 bandwidth.
Installation follows standard UDIMM procedure: align the notch, press until the clips lock, and verify detection in BIOS. Common issues arise when mixing ranks or speeds across channels, so use identically specified modules to avoid training failures.
| Brand | Lenovo |
|---|---|
| Capacity | 16GB |
| Type | 288-Pin DDR4 SDRAM |
| Speed | DDR4 2666 (PC4 21300) |
| Voltage | 1.20V |
| ECC | Yes |
| Buffered/Registered | Unregistered |
| Rank | 2Rx8 |
| Chipset | Major Brand Chipset |
Yes, the 288-pin DDR4 UDIMM matches the standard DDR4 slot layout used in compatible Lenovo systems.
Align the notch with the slot key, press straight down until both retention clips click, and verify the module sits flush with no gap.
DDR4 ECC UDIMMs typically run for the life of the platform; replace only if diagnostics report correctable errors rising or a module fails POST.
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