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Green rectangular DDR4 DIMM with black chips and gold contacts

A-Tech

A-Tech 4GB DDR4 2666MHz PC4-21300 DIMM 1Rx16 for Hynix HMA851U6CJR6N-VK HMA851U6DJR6N-VK Desktop Memory

SKU CH-GPTA-4P0H8

A 4 GB DDR4 2666 MHz desktop DIMM module, unbuffered non-ECC at 1.2 V, tested for reliable performance

  • Total capacity4 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • Tested speed2666
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Recommended forAMD & Intel Compatible
  • 4GB capacity lets you run more apps smoothly
  • DDR4 2666MHz speed keeps data moving at 21300 MT/s
  • 2V operation matches standard DDR4 voltage for efficient power use
  • 288-pin DIMM form factor fits common desktop motherboard slots
  • Non-ECC unbuffered design works with mainstream AMD and Intel systems

4GB DDR4 2666MHz Desktop Upgrade

This module delivers 4GB of DDR4 memory at 2666MHz for desktop computers. It serves as a direct replacement for Hynix HMA851U6CJR6N-VK and HMA851U6DJR6N-VK parts. The unbuffered, non-ECC design suits standard consumer motherboards. Builders seeking higher density or ECC functionality should look elsewhere.

PC4-21300 Standard Voltage Limits

The stick runs at the standard DDR4 voltage of 1.20V and is rated PC4-21300. Speed is fixed at 2666MHz; the module does not support XMP profiles or manual overclocking beyond the JEDEC specification. Systems limited to lower DDR4 frequencies will downclock automatically. Buyers needing guaranteed operation above 2666MHz cannot rely on this part.

288-Pin UDIMM Build and Compatibility

A 288-pin DIMM form factor fits any desktop DDR4 slot keyed for unbuffered memory. Single-rank 1Rx16 organisation keeps the electrical load light, aiding stability on boards with four populated slots. Gold-edge contacts resist oxidation through repeated seating cycles. The green PCB carries no heatsink, so clearance under oversized CPU coolers is never an issue.

How it compares

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

Price $32.99
Cheaper than about 77% 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 $8.25 per GB
Pricier than about 60% 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
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

Should I choose the 4GB module or a different capacity for my upgrade?

This listing supplies a single 4GB DDR4 2666MHz DIMM. Add one module to fill an empty slot or combine multiple kits to reach your desired total capacity.

What does the 2666MHz rating deliver in an actual desktop?

The module runs at 2666 MT/s, giving a PC4-21300 bandwidth rating. Real-world throughput depends on your motherboard and CPU memory controller.

Is the 288-pin DDR4 DIMM interface the limiting factor for speed?

The 288-pin DDR4 DIMM form factor carries the 2666MHz signal. Your platform's memory controller ultimately caps the operating frequency.

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