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Green 168-pin DIMM with eight black chips labeled AddOn 256MB PC133 CL3 3.30V

AddOn

AddOn AO16C3264-PC133 256MB PC133 CL3 3.30V memory upgrade

SKU CH-HFP9-5BQ64 MPN AO16C3264-PC133

256MB desktop memory module running at PC133 speed with CL3 latency and 3.30V unbuffered operation

  • Total capacity256 MB
  • Rated speedPC 133
  • CAS latencyCL3
  • Rated voltage3.3 V
  • Buffer typeUnbuffered
  • 256 MB capacity supports legacy desktop upgrades
  • PC133 speed matches older system requirements
  • CL3 latency suits period-correct timing specs
  • 30 V operation fits standard desktop slots
  • Unbuffered design works with non-server motherboards

256 MB PC133 Unbuffered SODIMM

This AddOn module delivers 256 MB of PC133 SDRAM with a CAS latency of 3 and a 3.30 V operating voltage. It is an unbuffered, non-ECC stick built to JEDEC standards for desktop upgrades. The part number is AO16C3264-PC133.

Suits legacy desktops requiring PC133 SDRAM

Builders restoring or expanding systems that accept PC133 unbuffered memory at CL3 can use this module. It is not suitable for machines that need registered or ECC memory, nor for platforms that require DDR or later memory technologies.

PC133 speed rating determines fit

The single specification that decides compatibility is the PC133 speed rating combined with the unbuffered, non-ECC, CL3 profile at 3.30 V. Only boards designed for this exact SDRAM generation will recognise and run the module correctly.

How it compares

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

Price $13.99
Cheaper than about 94% 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 $54.65 per GB
Pricier than about 90% of the 20,941 comparable items (median $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 nameAddOn - Memory Upgrades
Model nameAO16C3264-PC133
Total capacity256 MB
Performance
Rated speedPC 133
Memory
CAS latencyCL3
ECC supportNo
Buffer typeUnbuffered
Power
Rated voltage3.3 V
Size & build
Shipping weight0.02 kg
Package size165 × 76 × 6 mm

Questions about this item

What motherboard slot and voltage must my desktop already provide for this 3.30V PC133 module?

The module fits a standard 168-pin SDRAM DIMM socket and requires a 3.30V supply from the motherboard.

Will this unbuffered CL3 stick run reliably in a system that currently uses registered or ECC memory?

No, mixing unbuffered non-ECC memory with registered or ECC modules prevents the system from booting.

How can I confirm the stick is detected at PC133 CL3 after installation?

Enter the BIOS or run a memory-identification utility; it should report 256MB at 133MHz with CAS latency 3.

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