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Four green DDR4 registered DIMMs with black chips, no heat spreader

SK hynix

SK hynix HMA42GR7MFR4N-TF 64GB (4×16GB) DDR4-2133 CL15 Registered server RAM

SKU CH-YFNN-Z79MD MPN HMA42GR7MFR4N-TF

Four 16 GB registered DDR4-2133 modules totalling 64 GB at CL15 latency

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR4 2133 (PC4 17000)
  • CAS latencyCL15
  • Buffer typeRegistered
  • Memory rank2Rx4
  • Product type288-Pin DDR4 SDRAM
  • 64 GB total capacity from four 16 GB modules
  • Registered DDR4-2133 speed for stable server operation
  • CL15 CAS latency for responsive data access
  • 288-pin DIMM form factor fits standard server slots
  • 2 V operation reduces power draw per module

Server-grade capacity

This 64GB kit delivers four 16GB DDR4 modules for registered DIMM slots. It targets administrators expanding memory in rackmount or tower servers that require registered signalling. The CL15 latency and 1.2V operation match baseline DDR4-2133 specifications. Builders needing unbuffered desktop DIMMs or ECC protection should select a different product line.

Thermals and power

Each module runs at the standard 1.2V without a heat spreader, relying on chassis airflow for cooling. Registered buffering adds minimal electrical load compared with unbuffered equivalents at the same frequency. Power draw scales linearly with the four-module population, staying within typical DDR4-2133 limits. Systems with restricted DIMM spacing should verify airflow clearance before installation.

Build and connectors

The 288-pin DIMM form factor fits keyed DDR4 registered slots on compatible server mainboards. Four single-rank 2Rx4 modules populate two channels per socket on many dual-socket platforms. Absence of a heat spreader keeps module height low for dense configurations. Buyers requiring ECC correction or non-registered desktop memory must choose an alternative kit.

How it compares

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

Price $254.99
Pricier than about 57% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB (4 × 16 GB)
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $3.98 per GB
Cheaper than about 82% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameHynix
Product lineServer Memory
Model nameHMA42GR7MFR4N-TF
Total capacity64 GB (4 × 16 GB)
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2133 (PC4 17000)
Memory
CAS latencyCL15
ECC supportNo
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo

Questions about this item

How do I install the 288-pin registered DIMMs, and what step is often missed?

Align the notch with the slot key, press straight down until both latches click, and verify the server BIOS recognises all 64 GB; the missed step is forgetting to enable registered-memory support in BIOS.

What maintenance or replacement will the 4×16 GB kit need over time?

No heat spreaders are fitted, so keep chassis airflow clean; if a module fails, replace the single 16 GB stick rather than the full kit.

What limit appears first when the CL15 2133 MT/s modules run sustained workloads?

The CAS-15 latency at 2133 MT/s sets the throughput ceiling before thermal throttling becomes a factor.

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