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Green bare circuit board DDR4 memory module with black chips and gold edge connector

OWC

OWC 16GB DDR4 2666MHz PC4-21300 CL19 1.2V 288pin ECC Registered RDIMM for Lenovo ThinkAgile Xeon SP Gen 1

SKU CH-631P-PC82B

16 GB DDR4 2666 MHz ECC registered DIMM for Lenovo ThinkAgile Xeon SP Gen 1 servers

  • Total capacity16 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx8
  • 16GB capacity expands server memory for larger workloads
  • ECC registered design detects and corrects data errors automatically
  • DDR4 2666MHz speed matches Lenovo ThinkAgile Xeon SP Gen 1 specifications
  • 2V low voltage reduces power draw in dense configurations
  • Validated replacement for Lenovo part numbers 01AG618 4X70P98202 7X77A01303

Server Memory Upgrade

This 16GB DDR4 ECC Registered RDIMM is built for Lenovo ThinkAgile servers running Xeon SP Gen 1 processors. It targets administrators who need to expand capacity in HX3521-G, HX3720, HX3721, HX5520 or HX5521 systems. It will not work in standard desktop computers or with unbuffered modules.

Critical Specification

The module is a 288-pin DDR4 2666MHz PC4-21300 CL19 1.2V 2Rx8 Registered DIMM with ECC. That registered buffer and ECC combination is the single factor that decides compatibility; mixing it with unbuffered memory will prevent the system from booting.

Installation Notes

Installation follows the standard DIMM slot procedure for these ThinkAgile models. The most common error is attempting to pair this registered stick with unbuffered memory already present in the server, which causes a memory mismatch halt at POST.

How it compares

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

Price $108.99
Cheaper than about 67% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $6.81 per GB
Cheaper than about 58% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2R6D42R816 GB
Total capacity16 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.2 V

Other versions of this model

5 more in the same range

Questions about this item

Will the 2666 MHz speed run at that rate in my ThinkAgile HX3521-G?

Yes, the module is rated PC4-21300 2666 MHz CL19 and the ThinkAgile HX3521-G supports DDR4-2666, so it will operate at the full rated speed.

Does the ECC registered DDR4 interface limit mixing with other DIMM types?

ECC registered DDR4 cannot be mixed with unbuffered non-ECC DIMMs; all slots must use registered ECC modules for the system to function correctly.

Does the 288-pin registered form factor fit the ThinkAgile HX5520 memory slots?

The 288-pin DDR4 RDIMM matches the slot keying on the ThinkAgile HX5520 and HX5521, so it installs directly without adapters.

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