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Green rectangular 184-pin DDR333 memory module with black chips, 5.3 inches long, 1.4 inches wide

IBM

IBM 31P8855 256MB DDR333 memory upgrade

SKU CH-6KT2-ZFJNK

256 MB DDR333 memory module for compatible ThinkCentre desktops, CL2.5 unbuffered, 184-pin

  • Rated speedDDR SDRAM
  • CAS latencyCL2.5
  • ECC supportNon-parity
  • Buffer typeUnbuffered
  • Boosts system performance with 256MB DDR333 memory
  • Fast 2700MB/sec data rate for demanding applications
  • CL2.5 latency improves multitasking responsiveness
  • 184-pin unbuffered design fits compatible ThinkCentre desktops
  • New IBM module ensures reliable desktop upgrades

256MB DDR333 module for ThinkCentre

This 256MB DDR SDRAM module runs at 333MHz with CL2.5 latency and is built for IBM ThinkCentre A30, A50, A50p, M50 and S50 desktops listed by machine type. It adds capacity to systems that still use 184-pin unbuffered non-parity DIMMs.

Install by seating the 184-pin DIMM

Align the notch on the module with the key in the slot and press firmly until the retention clips click. The most common issue is inserting the stick backwards or not pressing hard enough to engage both clips, which leaves the module partially seated.

PC2700 standard decides compatibility

The module follows the DDR333/PC2700 standard with a 2700MB/sec peak transfer rate, so it only works in boards that officially support that speed and density. Systems requiring registered, ECC or faster DDR memory cannot use this part.

How it compares

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

Price $18.99
Cheaper than about 91% of the 21,161 comparable items (median $397.99).

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 nameIBM
Performance
Rated speedDDR SDRAM
Memory
CAS latencyCL2.5
ECC supportNon-parity
Buffer typeUnbuffered

Questions about this item

How do I verify the 333 MHz DDR333 module is running at full speed after installation?

Enter the BIOS or use a system-information tool such as CPU-Z and confirm the memory frequency reads 333 MHz with CL2.5 timings.

What comes in the package and do I need any extra parts to install this 184-pin DIMM?

The box contains one 256 MB unbuffered non-parity DDR333 module; no additional components are required for a compatible desktop.

Which ThinkCentre models are confirmed compatible with the 31P8855 256 MB stick?

Supported systems include ThinkCentre A30 2296, 8191, 8198, 8199, 8316, 8434; A50 8320; A50p 8192-8197; M50 8185-8190; and S50 8183, 8184.

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