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 bare PCB DDR4 DIMM module with black memory chips and gold contacts

A-Tech

A-Tech 4GB DDR4 2666MHz CL19 1Rx16 Desktop RAM

SKU CH-DHHJ-PNJEN

A 4GB DDR4 2666MHz CL19 unbuffered DIMM built as a compatible replacement for Hynix HMA851U6JJR6N-VK

  • Total capacity4 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL19
  • Tested speed2666
  • Rated voltage1.2 V
  • Boosts system responsiveness with 4GB DDR4 2666MHz module
  • CL19 latency supports smooth multitasking
  • 20V standard voltage keeps power draw low
  • 288-pin DIMM fits standard desktop slots
  • Tested compatible replacement for Hynix HMA851U6JJR6N-VK

A-Tech 4GB DDR4 2666MHz Desktop RAM

This 4GB DDR4 module runs at 2666MHz with CL19 latency and 1.20V operation. It is built as a compatible replacement for the Hynix HMA851U6JJR6N-VK part. The unbuffered non-ECC DIMM suits standard desktop systems needing a straightforward memory upgrade.

Sustained load behaviour

Rated at PC4-21300 bandwidth, the stick delivers steady throughput for everyday multitasking and background workloads. CL19 timing and 1.20V voltage keep power draw predictable during extended sessions. Quality assurance testing on each module aims to maintain consistent reliability over time.

Build and connectors

The 288-pin DIMM fits regular desktop slots without a heat spreader, leaving a low profile for tight spaces. Major-brand chipsets are used throughout the 1Rx16 organisation. Unbuffered design means direct connection to the memory controller for simple installation.

How it compares

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

Price $23.99
Cheaper than about 84% 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 $6.00 per GB
Cheaper than about 59% of the 3,251 comparable items (median $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
Product lineCompatible Replacement for Hynix
Model nameHMA851U6JJR6N-VK
Total capacity4 GB
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL19
Tested speed2666
ECC supportNo
Buffer typeUnbuffered
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Recommended forCompatible Replacement for Hynix HMA851U6JJR6N-VK

Questions about this item

Will the 1.20V DDR4 module run cool and quiet inside a desktop that stays on all day?

The module operates at the standard 1.20V DDR4 voltage with no heat spreader, so it draws little power and adds minimal heat to a system running continuously.

Does this 288-pin DIMM need anything beyond a free DDR4 slot on the motherboard?

It requires a desktop motherboard with an available 288-pin DDR4 DIMM slot that supports 2666MHz unbuffered non-ECC memory; no extra cables or adapters are needed.

Can I add this CL19 stick alongside an existing 2666MHz module from another brand?

Yes, it will run at 2666MHz CL19 in dual-channel if the other module matches speed and voltage, though the system will default to the slower timing if they differ.

More in Desktop RAM

Similar items