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Green 240-pin DDR3 DIMM with black memory chips and gold contacts

HP

HP 500668-B21 1GB DDR3 1333 ECC Unbuffered Memory Upgrade

SKU CH-AV0X-G13YP MPN 500668-B21

1GB DDR3 1333 ECC unbuffered DIMM for compatible HP ProLiant G6 servers

  • Total capacity1 GB
  • Rated speedDDR3 1333 (PC3 10600)
  • CAS latencyCL9
  • Buffer typeUnbuffered
  • Product type240-Pin DDR3 SDRAM
  • Compatible systemsHP/Compaq
  • ECC protection guards data integrity in critical workloads
  • DDR3 1333 speed supports responsive server performance
  • CL9 latency enables efficient memory access timing
  • Unbuffered design suits compatible ProLiant blade and workstation systems
  • 240-pin DDR3 form factor fits validated HP server platforms

HP ProLiant Server Memory Upgrade

This 1GB DDR3 ECC unbuffered module is designed for HP ProLiant BL and WS series servers including the BL280c G6, BL2x220c G6, BL460c G6, BL490c G6 and WS460c G6. It adds capacity to systems that require HP-qualified memory for reliable operation. Builders needing higher density modules or registered DIMMs cannot use this part.

Low Power DDR3 Operation

The DDR3 1333 PC3 10600 standard operates at a lower voltage than previous generations, reducing power draw and heat output during normal server workloads. CL9 latency timings support efficient data access without increasing thermal load. The unbuffered design eliminates register components, further minimising energy consumption in compatible platforms.

Stable Sustained Throughput

ECC error correction maintains data integrity during continuous operation, preventing silent corruption that can crash long-running tasks. Single rank organisation allows the memory controller to manage sustained bandwidth efficiently across populated slots. The module delivers consistent throughput for extended compute jobs without the error accumulation seen in non-ECC alternatives.

How it compares

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

Price $10.99
Cheaper than about 96% of the 21,161 comparable items (median $397.99).
Total capacity 1 GB
Lower than about 98% of the 20,941 comparable items (median 32 GB).
Price per GB $10.99 per GB
Pricier than about 55% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameHP
Model name500668-B21
Total capacity1 GB
Product type240-Pin DDR3 SDRAM
Performance
Rated speedDDR3 1333 (PC3 10600)
Memory
CAS latencyCL9
ECC supportYes
Buffer typeUnbuffered
Size & build
Shipping weight0.02 kg
Package size163 × 38 × 6 mm
Compatibility
Compatible systemsHP/Compaq

Questions about this item

How do I install the 240-Pin DDR3 DIMM into a ProLiant BL460c G6, and which slot-population rule is commonly missed?

Power down the server, open the chassis, align the notch on the 240-Pin DDR3 module with the slot key, press firmly until the ejector tabs click, then follow the BL460c G6 memory guide which requires filling the lowest-numbered slots on each channel first — skipping that sequence is the step most often missed.

What maintenance or replacement will the 1GB ECC Unbuffered module need over its service life?

The module itself has no moving parts or batteries; plan only for periodic dust removal from the DIMM slots with compressed air and replacement if ECC correctable-error counts reported by the iLO or BIOS begin to rise.

At what point does the CL9 latency at 1333 MT/s become the bottleneck during sustained workloads?

In memory-bound streams the CL9 timing at 1333 MT/s caps effective bandwidth at the PC3 10600 rate, so once the working set exceeds cache and the ProLiant memory controller saturates both channels, latency becomes the limiting factor.

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