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Two green DDR2 memory modules with gold contacts and silver heat spreaders

Kingston Technology Corp.

Kingston Technology Corp. KTH-XW9400K2/16G 16GB (2 x 8GB) DDR2 667 ECC Registered memory upgrade

SKU CH-YFHQ-RJHS9 MPN KTH-XW9400K2/16G

16 GB DDR2-667 ECC registered dual-rank kit for HP/Compaq workstations

  • Capacity16GB (2 x 8GB)
  • Type240-Pin DDR2 SDRAM
  • SpeedDDR2 667
  • Voltage1.80V
  • ECCYes
  • Buffered/RegisteredRegistered
  • ECC protection prevents data corruption in critical workloads
  • Registered design improves signal integrity for stable server operation
  • Dual-rank 2Rx4 organisation maximises 16 GB capacity across two modules
  • DDR2 667 speed matches HP/Compaq workstation specifications
  • 80 V operation meets original system voltage requirements

HP/Compaq DDR2 667 Kit

This 16GB kit contains two 8GB registered ECC DDR2 667 modules built for HP and Compaq systems that require 240-pin DDR2 SDRAM. The dual-rank 2Rx4 design runs at 1.80V and matches the original HP part numbers 408855-B21 and 495605-B21. It is a direct replacement for qualified workstations and servers.

Registered ECC Only

The modules are fully buffered registered ECC memory, so they suit HP/Compaq platforms that specifically demand registered error-correcting DDR2. Systems that accept only unbuffered non-ECC DDR2 or that require a different pin count or voltage will not support this kit.

240-Pin DDR2 667 Form Factor

The 240-pin DDR2 667 interface is the single specification that decides fitment; the motherboard must accept registered ECC DDR2 at this speed and pin layout or the modules will not install or function.

Highlights

  • ECC protection prevents data corruption in critical workloads
  • Registered design improves signal integrity for stable server operation
  • Dual-rank 2Rx4 organisation maximises 16 GB capacity across two modules
  • DDR2 667 speed matches HP/Compaq workstation specifications
  • 80 V operation meets original system voltage requirements

Specifications

BrandKingston
ModelKTH-XW9400K2/16G
Capacity16GB (2 x 8GB)
Type240-Pin DDR2 SDRAM
SpeedDDR2 667
Voltage1.80V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Compatible SystemHP/Compaq
FeaturesDual Rank
Mfgr's System P/N's: 408855-B21 (HP/Compaq); 495605-B21 (1/4 of 64GB) (HP/Compaq); EV285AA (2pcs) (HP/Compaq)
Shipping weight0.06 kg
Package size170 × 91 × 14 mm

Questions about this item

Should I choose the 16GB kit or look for a larger capacity?

This kit provides 16GB as two 8GB modules, matching the 495605-B21 part that represents one quarter of a 64GB maximum configuration for the supported HP/Compaq systems.

What does the DDR2 667 rating mean for actual system performance?

The modules run at 667 MT/s with 1.80V voltage and registered ECC operation, so the memory controller in the target HP/Compaq workstation will operate at that speed with error correction and signal buffering active.

Does the 240-pin DDR2 interface limit the bandwidth in practice?

Yes, the 240-pin DDR2 SDRAM interface caps the data rate at 667 MT/s, and the registered 2Rx4 organisation adds one clock cycle of latency while providing the electrical buffering required by the compatible HP/Compaq platforms.

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