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Refurbished green 240-pin DDR3 DIMM with black memory chips and gold edge contacts

HP Refurbished

HP 684066-S21 16GB DDR3 1600MHz CL11 ECC Registered Server RAM

SKU CH-HC2B-JAQF7 MPN 684066-S21

A 16 GB DDR3 server DIMM with ECC and registered signal processing at 1600 MHz CL11

  • Rated speed1600 MHz
  • CAS latencyCL11
  • Product type240-Pin DDR3 SDRAM
  • 16 GB capacity supports large server workloads
  • DDR3-1600 speed delivers 12800 MT/s data rate
  • ECC registered design protects data integrity
  • CL11 latency keeps response times low
  • 240-pin DIMM fits compatible HP server slots

16GB DDR3 ECC Registered DIMM

This HP 684066-S21 module provides 16GB of DDR3 SDRAM operating at 1600 MHz with CL11 latency. It uses a 240-pin DIMM form factor and includes ECC error checking with registered signal processing for server stability.

Suited for HP servers requiring PC3-12800

IT administrators upgrading or repairing compatible HP ProLiant systems that specifically call for DDR3-1600 ECC registered modules will find this part matches the required specification. Buyers whose platforms require unbuffered memory, a different DDR generation, or a different pin count cannot use this module.

Registered ECC signal processing

The registered buffer and ECC functionality are mandatory for the target server chipsets; a system expecting unbuffered non-ECC DIMMs will not operate with this module. Verify the server maintenance guide lists the 684066-S21 part number before purchase.

How it compares

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

Price $44.99
Cheaper than about 86% of the 6,523 comparable items (median $188.99).

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 nameHP
Product type240-Pin DDR3 SDRAM
Performance
Rated speed1600 MHz
Memory
CAS latencyCL11
Size & build
Shipping weight0.23 kg
Package size178 × 51 × 13 mm

Questions about this item

Will the 240-pin DDR3 DIMM need replacement once the server reaches its maximum memory capacity?

The 16 GB module occupies one DIMM slot; future upgrades depend on how many slots your server board provides and its total supported capacity.

What limits sustained throughput on this CL11 registered ECC module?

The DDR3-1600 interface caps continuous bandwidth at the PC3-12800 data rate, so the memory bus itself becomes the bottleneck before the CAS latency does.

How much extra heat does a 1600 MHz registered ECC stick add when the server runs 24/7?

Registered ECC DIMMs draw slightly more power than unbuffered modules, but at the standard DDR3 voltage the thermal contribution remains modest inside normal server airflow.

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