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Two green DDR4 UDIMM sticks, black chips, gold contacts

SK hynix

SK hynix HMA851U6DJR6N-XN 8GB (2x4GB) DDR4 3200MHz PC4-3200AA UDIMM 1.2V desktop RAM

SKU CH-5TJR-94ZVS MPN HMA851U6DJR6N-XN

A matched pair of 4 GB unbuffered DDR4 modules running at 3200 MHz with a low 1.2 V operating voltage

  • Capacity8GB (2 x 4GB)
  • SpeedDDR4 3200 (PC4 25600)
  • Voltage1.20V
  • ECCNo
  • Buffered/RegisteredUnbuffered
  • Dual-channel 8 GB kit boosts multitasking headroom
  • 3200 MHz DDR4 speed feeds data faster to the CPU
  • Low 1.2 V operation reduces system power draw
  • Unbuffered 288-pin UDIMM fits standard desktop slots
  • Two 4 GB modules enable matched-pair performance

Kit composition

This SK hynix kit provides 8 GB of desktop memory as two 4 GB unbuffered UDIMM modules. It suits builders adding standard capacity to a DDR4 platform. Buyers who want more storage or need ECC error correction should look elsewhere.

DDR4 interface limits

The modules run at DDR4 3200 (PC4-25600) with a 1.2 V operating voltage and 288 pins. This is the electrical and mechanical ceiling of the DDR4 UDIMM standard; faster speeds or lower voltages are not defined for this form factor.

Matched-pair specification

The two modules are factory matched for identical 4 GB capacity and DDR4 3200 timing. A single module or a mixed-capacity set would not deliver the same dual-channel behaviour.

Highlights

  • Dual-channel 8 GB kit boosts multitasking headroom
  • 3200 MHz DDR4 speed feeds data faster to the CPU
  • Low 1.2 V operation reduces system power draw
  • Unbuffered 288-pin UDIMM fits standard desktop slots
  • Two 4 GB modules enable matched-pair performance

Specifications

BrandHynix
SeriesDesktop Memory
ModelHMA851U6DJR6N-XN
Capacity8GB (2 x 4GB)
SpeedDDR4 3200 (PC4 25600)
Voltage1.20V
ECCNo
Buffered/RegisteredUnbuffered

Questions about this item

Should I pick the 2x4GB kit or a single 8GB module?

This kit provides two 4GB modules for 8GB total, enabling dual-channel operation on boards with two or four slots; a single 8GB stick would run in single-channel mode unless a second identical module is added later.

What does the DDR4-3200 rating deliver in daily use?

The modules run at 3200 MT/s with a PC4-25600 bandwidth ceiling, giving noticeably snappier multitasking and gaming frame-times versus 2666 MT/s memory when the CPU and motherboard support the speed.

Will the 288-pin UDIMM fit my DDR4 board and what speed ceiling applies?

Yes, the 288-pin unbuffered DIMM is the standard DDR4 desktop form factor; the kit is rated for DDR4-3200 (PC4-25600) and will down-clock automatically if the platform only supports a lower data rate.

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