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Green 168-pin SDRAM DIMM with silver chips, HP 236852-B21 label

HP

HP 236852-B21 256MB PC 133 ECC Registered 168-Pin SDRAM Memory Upgrade

SKU CH-97FX-NWR6Z MPN 236852-B21

256MB PC 133 ECC registered 168-pin SDRAM module for HP/Compaq ProLiant DL740 servers

  • Total capacity256 MB
  • Rated speedPC 133
  • Buffer typeRegistered
  • Product type168-Pin SDRAM
  • Compatible systemsHP/Compaq
  • Key featuresCompatible with Compaq ProLiant DL740
  • 256MB capacity expands server memory for larger workloads
  • PC 133 speed delivers 133MHz data transfer rate
  • ECC Registered design detects and corrects memory errors
  • 168-pin SDRAM form factor fits compatible HP/Compaq ProLiant DL740 systems
  • HP part 236852-B21 ensures validated compatibility with target servers

256 MB PC 133 ECC Registered SDRAM

This HP module adds 256 MB of 133 MHz SDRAM to compatible ProLiant servers. It uses a 168-pin form factor with ECC and registered buffering for data integrity in multi-processor environments. The part number is 236852-B21 and it is supplied new from HP.

Suits DL740 upgrades; not for non-ECC

This memory fits the Compaq ProLiant DL740 and other HP systems that require PC 133 ECC registered DIMMs. It will not work in platforms that need unbuffered, non-ECC, DDR or any later memory standard. Buyers with consumer desktops or newer servers should look elsewhere.

168-pin PC 133 registered ECC interface

The decisive specification is the 168-pin PC 133 registered ECC interface. Only systems designed for this exact electrical and mechanical standard can accept the module. Verify your server documentation before purchase.

How it compares

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

Price $37.99
Cheaper than about 81% of the 21,161 comparable items (median $397.99).
Total capacity 256 MB
Lower than about 99% of the 20,941 comparable items (median 32 GB).
Price per GB $148.40 per GB
Pricier than about 90% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameHP
Model name236852-B21
Total capacity256 MB
Product type168-Pin SDRAM
Performance
Rated speedPC 133
Memory
ECC supportYes
Buffer typeRegistered
Compatibility
Compatible systemsHP/Compaq

Questions about this item

Will the 168-pin SDRAM module fit the memory slots on my Compaq ProLiant DL740?

Yes, the 168-pin form factor matches the DIMM slots used in the ProLiant DL740 server.

What is the correct way to install this registered ECC memory, and what step is often missed?

Power down the server, open the chassis, align the notch on the 168-pin module with the slot key, press firmly until both retention clips lock, then verify the 256MB capacity is recognised in the system BIOS.

How do I know when this PC133 ECC registered module should be replaced?

Replace the module if the server reports corrected ECC errors in the system log, fails memory diagnostics at 133MHz, or becomes unstable under load.

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