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Green 260-pin DDR4 SO-DIMM module with black chips, 4 GB capacity

A-Tech

A-Tech 4GB DDR4 2133MHz CL15 1.2V SODIMM Synology D4NS2133-4G laptop RAM

SKU CH-A87W-NP844

A 4 GB DDR4 SODIMM module running at 2133 MHz with CL15 latency and 1.2 V operation, validated as a direct replacement for Synology D4NS2133-4G

  • Total capacity4 GB
  • Rated speedDDR4 2133 (PC4 17000)
  • CAS latencyCL15
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Recommended forAMD & Intel Compatible
  • 4GB DDR4 2133MHz CL15 boosts multitasking
  • 2V standard voltage reduces power draw
  • 260-pin SODIMM fits laptop memory slots
  • Non-ECC unbuffered design ensures broad compatibility
  • Major-brand chips tested for reliable operation

4GB DDR4 2133MHz SODIMM for Synology

This 4GB DDR4 2133MHz CL15 SODIMM module is built as a direct replacement for the Synology D4NS2133-4G. It uses 260-pin DDR4 technology at 1.2V and is suited to laptops, notebooks, or all-in-one systems that accept a single non-ECC unbuffered stick.

Ideal for Synology NAS upgrades.

The module fits Synology units that specify the D4NS2133-4G part and works with AMD and Intel platforms that support standard DDR4 SO-DIMM memory. Buyers whose systems require ECC error correction or registered buffering should look elsewhere, as this stick provides neither feature.

2133MHz DDR4 speed rating

The decisive specification is the DDR4 2133 (PC4-17000) speed grade. Your motherboard or NAS must list DDR4 2133MHz support; a platform that only runs at a different DDR4 data rate will not operate correctly with this module.

How it compares

Measured against everything we stock in Laptop RAM, at today’s prices. Recalculated every night.

Price $29.99
Cheaper than about 74% of the 2,079 comparable items (median $70.99).
Total capacity 4 GB
Lower than about 80% of the 1,886 comparable items (median 16 GB).
Price per GB $7.50 per GB
Pricier than about 65% of the 1,886 comparable items (median $5.94 per GB).

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 nameA-Tech
Total capacity4 GB
Product type260-Pin DDR4 SO-DIMM
Performance
Rated speedDDR4 2133 (PC4 17000)
Memory
CAS latencyCL15
ECC supportNo
Buffer typeUnbuffered
Power
Rated voltage1.2 V
Compatibility
Recommended forAMD & Intel Compatible

Questions about this item

What motherboard slot is required for this 260-pin DDR4 SO-DIMM?

This module fits a standard 260-pin DDR4 SO-DIMM slot found in compatible laptops, notebooks, or all-in-one systems.

Will this CL15 1.20V module run stably alongside existing DDR4 2133 memory?

Yes, it operates at DDR4 2133 (PC4-17000) with CL15 latency and 1.20V, matching the JEDEC baseline for that speed so it will sync with identical-spec modules.

How can I confirm the system recognises the full 4GB after installation?

Check the BIOS/UEFI memory summary or the OS task manager; both should report the additional 4GB at 2133 MHz.

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