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Green rectangular DDR3 memory module with gold contacts and black chips P/N 500666-B21

HP

HP 500666-B21 16GB 240-Pin DDR3 1066 Registered memory upgrade

SKU CH-7S88-KCF7Y MPN 500666-B21

16 GB DDR3 registered module running at 1066 MHz for HP and Compaq systems

  • Total capacity16 GB
  • Rated speedDDR3 1066 (PC3 8500)
  • Buffer typeRegistered
  • Product type240-Pin DDR3 SDRAM
  • Compatible systemsHP/Compaq
  • 16 GB capacity supports larger workloads
  • DDR3 1066 speed delivers PC3 8500 bandwidth
  • Registered design improves signal integrity
  • 240 pin DDR3 form factor fits HP Compaq systems
  • Model 500666 B21 ensures correct part match

16 GB registered DDR3 module

This 16 GB DDR3 1066 module uses a 240-pin registered design for HP and Compaq systems. The PC3 8500 rating confirms the rated transfer speed. Registered buffering helps the memory controller manage heavy loads. It is sold as a new component.

Suitable for HP servers needing registered memory

This module fits HP or Compaq platforms that require registered DDR3 1066 DIMMs. Systems that accept only unbuffered memory cannot use it. Builders needing a different speed or capacity must select another part. Compatibility depends on the exact system specification.

Registered DDR3 1066 specification

The registered DDR3 1066 (PC3 8500) specification is the single detail that determines fit. Only motherboards designed for registered DDR3 at this speed will post correctly. Verify the platform manual before purchase. No other memory type will substitute.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $121.99
Cheaper than about 65% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $7.62 per GB
Typical for this category: the median of 20,941 items is $8.19 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 nameHP
Model name500666-B21
Total capacity16 GB
Product type240-Pin DDR3 SDRAM
Performance
Rated speedDDR3 1066 (PC3 8500)
Memory
Buffer typeRegistered
Size & build
Shipping weight0.07 kg
Package size185 × 89 × 8 mm
Compatibility
Compatible systemsHP/Compaq

Questions about this item

Will the registered DDR3 1066 modules maintain stability in an HP server running continuous workloads?

Registered DDR3 1066 modules reduce electrical load on the memory controller, helping HP/Compaq systems sustain stability during extended operation.

How much heat and power do these 16GB registered DIMMs generate under all-day load?

DDR3 1066 registered DIMMs operate at standard DDR3 voltage with lower per-pin current, producing modest heat that typical server airflow handles.

Which HP or Compaq models accept 240-pin DDR3 1066 registered memory for this upgrade?

This 500666-B21 kit is validated for HP/Compaq systems that support 240-pin DDR3 1066 registered modules up to 16GB per slot.

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