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Green rectangular DDR4 DIMM module with gold contacts and black chips

Lenovo

Lenovo 7X77A01303 16GB DDR4 2666MHz CL17 RDIMM memory upgrade

SKU CH-CWX6-28SBM MPN 7X77A01303

16 GB DDR4 RDIMM running at 2666 MHz with CL17 latency and ECC for ThinkSystem servers

  • 16GB DDR4 RDIMM expands server capacity
  • 2666MHz CL17 speed supports demanding workloads
  • 2V registered ECC design improves data integrity
  • 288-pin DIMM fits ThinkSystem SD530, SR530, SR550, SR570, SR590, SR650, SR850, SR860, SR950, ST550
  • Lenovo TruDDR4 qualification ensures reliable compatibility

16 GB DDR4 RDIMM for ThinkSystem servers

This 16 GB DDR4 registered DIMM runs at 2666 MHz with CL17 latency and 1.2 V operation. It is built for ThinkSystem SD530, SN850, SR530, SR550, SR570, SR590, SR650, SR850, SR860, SR950 and ST550 servers requiring ECC memory.

288-pin registered DIMM with ECC

The module uses a standard 288-pin DIMM form factor and registered signal processing to support high-density server configurations. Error-correcting code protects data integrity in mission-critical workloads while the 1.2 V rating keeps power draw low.

Single-module kit simplifies upgrades

Supplied as one 16 GB stick, it lets administrators add capacity in precise increments without populating channels in pairs. The TruDDR4 validation ensures compatibility with the listed ThinkSystem platforms and includes a one-year limited warranty.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $321.99
Typical for this category: the median of 21,161 items is $397.99.

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameLenovo
Model name7 × 77A01303
Size & build
Shipping weight0.91 kg
Package size159 × 60 × 20 mm

Questions about this item

What is the PC4-21300 rating on this DDR4 module and what speed does it cap at?

The PC4-21300 rating corresponds to the 2666 MHz data rate, which is the maximum JEDEC speed this RDIMM is specified to run at.

Will this 288-pin DIMM fit the memory slots in a ThinkSystem SR650 server?

Yes, the 288-pin DIMM form factor matches the DDR4 slots used in the ThinkSystem SR650 and the other listed ThinkSystem servers.

How is this RDIMM installed and what step is often missed?

Align the notch on the module with the slot key, press firmly until both side clips click shut; the step often missed is verifying the clips are fully locked on both sides.

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