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Green 288-pin DDR4 DIMM with black memory chips, no heat spreader

HP

HP 805671-B21 16GB DDR4 2133 ECC Unbuffered server RAM

SKU CH-Y5VT-KT6F6 MPN 805671-B21

16 GB DDR4 ECC unbuffered DIMM running at 2133 MHz with CL15 timing for ProLiant Gen9 servers

  • Total capacity16 GB
  • Rated speedDDR4 2133 (PC4 17000)
  • CAS latencyCL15
  • Memory timings15-15-15
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • ECC protection prevents data corruption in critical workloads
  • 16 GB capacity supports larger datasets in entry-level servers
  • DDR4 2133 speed delivers 17000 MB/s bandwidth for responsive performance
  • CL15 timing at 1.20 V balances low latency with efficient power use
  • 288-pin unbuffered DIMM fits HPE ProLiant Gen9 ML and DL 10/100 families

HP 16GB DDR4 2133 ECC Unbuffered DIMM

This 16GB DDR4 module runs at 2133 MT/s with CL15 timing and 1.20V operation. It provides ECC error correction in an unbuffered design for data integrity in entry-level server workloads. The dual-rank 2Rx8 organisation fits 288-pin slots in HPE ProLiant Gen9 ML and DL 10/100 families.

Thermals and Power at DDR4 2133

Operating at 1.20V keeps power draw low and heat output modest without a heat spreader. Standard server airflow handles the thermal load quietly at the rated 2133 MT/s speed. The unbuffered topology avoids registered-buffer overhead, helping efficiency in normal use.

Build Fit: 288-Pin DDR4 Slots

The single 16GB DIMM occupies one 288-pin DDR4 slot and requires no extra cooling hardware. It frees remaining slots for future capacity increases up to the platform limit. Builders needing registered memory or higher speeds must choose a different module.

How it compares

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

Price $247.99
Pricier than about 56% of the 6,523 comparable items (median $188.99).
Total capacity 16 GB
Lower than about 60% of the 6,064 comparable items (median 32 GB).
Price per GB $15.50 per GB
Pricier than about 76% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameHP
Model name805671-B21
Total capacity16 GB
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2133 (PC4 17000)
Memory
CAS latencyCL15
Memory timings15-15-15
ECC supportYes
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.2 V
Size & build
Shipping weight0.91 kg
Package size191 × 89 × 1 mm

Questions about this item

How do I install the 288-pin DDR4 DIMM and which slot order do people often get wrong?

Align the notch on the 288-pin DDR4 module with the slot key, press straight down until the latches click, and populate the lowest-numbered channel slots first — many builders skip the channel sequence and lose dual-rank performance.

What maintenance or replacement will the 16GB ECC unbuffered kit need over its service life?

No scheduled maintenance is required; if a correctable error count rises or a DIMM fails POST, replace the affected 16GB stick — the module has no heat spreader or moving parts to service.

What limit appears first when the 2133 MT/s CL15 memory runs under sustained load?

The JEDEC 1.20 V voltage ceiling is reached before thermal throttling, so sustained write-heavy workloads hit the voltage guard band first.

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