We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Green rectangular circuit board with 288 gold pins and black memory chips

A-Tech

A-Tech 4GB DDR4 2666MHz PC4-21300 288-Pin DIMM Desktop RAM

SKU CH-9GKJ-623ZB

4GB DDR4 2666MHz desktop DIMM module running at 1.2V for broad AMD and Intel compatibility

  • Total capacity4 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • Tested speed2666
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Recommended forAMD & Intel Compatible
  • 4GB capacity expands multitasking headroom for everyday workloads
  • DDR4 2666 MHz speed matches PC4-21300 bandwidth rating
  • 20V standard voltage keeps power draw low
  • 288-pin DIMM form factor fits standard desktop slots
  • Tested replacement for Samsung M378A5244BB0-CTD modules

4GB DDR4 2666MHz desktop memory

This 4GB DDR4 module runs at 2666MHz with a PC4-21300 rating and standard 1.20V operation. It is an unbuffered non-ECC DIMM built for desktop computers. The single 1Rx16 stick fits 288-pin slots and is tested for AMD and Intel platform compatibility.

Replaces Samsung M378A5244BB0-CTD modules

This stick is a direct replacement for Samsung part numbers M378A5244BB0-CTD, M378A5244CB0-CTD and M378A5244CBO-CTD. The upgrade is worth it when your system needs additional capacity or a matching stick to complete a dual-channel pair. Each module undergoes quality assurance testing for dependable performance.

Check your motherboard DDR4 slot count

Verify that your board accepts 288-pin unbuffered non-ECC DDR4 DIMMs and supports 2666MHz speed at 1.20V. Confirm the total memory limit per slot and overall so the 4GB module does not exceed it. Ensure an empty slot is available for installation.

How it compares

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

Price $28.99
Cheaper than about 79% of the 3,647 comparable items (median $90.99).
Total capacity 4 GB
Lower than about 80% of the 3,251 comparable items (median 16 GB).
Price per GB $7.25 per GB
Typical for this category: the median of 3,251 items is $6.75 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
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
Tested speed2666
ECC supportNo
Buffer typeUnbuffered
Power
Rated voltage1.2 V
Compatibility
Recommended forAMD & Intel Compatible

Questions about this item

Will this 4 GB DDR4 2666 MHz module fit my desktop's 288-pin DIMM slots?

Yes — the stick is a standard 288-pin unbuffered DIMM that installs in any desktop DDR4 slot keyed for 2666 MHz operation.

Can I add this stick alongside my existing DDR4 memory without changing BIOS settings?

It runs at the standard 1.2 V JEDEC voltage, so most motherboards will auto-detect the correct frequency and timings without manual adjustment.

Is this module a direct replacement for Samsung part numbers M378A5244BB0-CTD, M378A5244CB0-CTD and M378A5244CBO-CTD?

The specifications match — 4 GB, 1Rx16 organisation, DDR4 2666, PC4-21300, non-ECC unbuffered — making it a compatible substitute for those Samsung modules.

More in Desktop RAM

Similar items