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Four black DDR2 UDIMM modules in a kit

OWC

OWC 4GB (4x1GB) DDR2 533 PC2-4200 CL4 1.8V Non-ECC UDIMM Kit

SKU CH-N3A3-ADBP3

Four 1 GB DDR2 533 modules run at CL4 latency and 1.8 V for desktop upgrades

  • Total capacity4 GB (4 × 1 GB)
  • Rated speedDDR2 533 (PC2 4200)
  • CAS latencyCL4
  • Rated voltage1.8 V
  • Buffer typeUnbuffered
  • Kit configurationDual Channel Kit

Capacity 4GB (4 x 1GB)

  • 4GB total capacity from four 1GB modules
  • DDR2 533 speed with CL4 latency for responsive operation
  • 8V JEDEC standard voltage ensures broad desktop compatibility
  • Unbuffered non-ECC design suited for consumer desktop boards
  • 240-pin UDIMM form factor fits standard DDR2 slots

OWC DDR2 533 4GB Kit

This OWC kit provides four 1 GB DDR2 533 modules for a total of 4 GB. It is built as an unbuffered non-ECC upgrade for desktop systems that accept 240-pin DIMMs. Each module runs at the standard 1.8 V JEDEC voltage and carries a CL4 latency rating. The kit targets users who need a straightforward capacity increase on older platforms.

Sustained load behaviour

JEDEC-compliant DDR2 533 modules maintain their rated 533 MT/s data rate and CL4 timing during extended use because they operate at the specified 1.8 V without overclocking. The unbuffered design adds no extra register delay, so latency stays consistent across long sessions. ROHS-compliant components and OWC in-house validation reduce the risk of thermal throttling or errors over time.

Deciding specification

The critical figure is the DDR2 533 (PC2-4200) speed rating combined with the 240-pin form factor. A motherboard must explicitly support DDR2 533 unbuffered non-ECC DIMMs at 1.8 V for these modules to function. If the board requires a different DDR generation, a higher voltage, or registered memory, this kit will not be compatible.

How it compares

Measured against everything we stock in Desktop RAM, at today’s prices. Recalculated every night.

Price $63.99
Cheaper than about 59% of the 3,647 comparable items (median $90.99).
Total capacity 4 GB (4 × 1 GB)
Lower than about 80% of the 3,251 comparable items (median 16 GB).
Price per GB $16.00 per GB
Pricier than about 90% of the 3,251 comparable items (median $6.75 per GB).

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Specifications

Product
Brand nameOWC
Part number4U2D21R8004S
Total capacity4 GB (4 × 1 GB)
Product colorBlack
Performance
Rated speedDDR2 533 (PC2 4200)
Memory
CAS latencyCL4
ECC supportNo
Buffer typeUnbuffered
Kit configurationDual Channel Kit
Heat spreaderNo
Power
Rated voltage1.8 V
Compatibility
Recommended forDesktops
More details
LED lightingNone

Other versions of this model

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Questions about this item

How much heat will the four 1.8 V DDR2 modules generate during continuous all-day use?

Each module runs at the standard 1.8 V JEDEC voltage for DDR2 533, so heat output is typical for unbuffered desktop DIMMs; the kit has no heat spreaders, so case airflow is the main cooling path.

What must the desktop already provide to accept this 240-pin UDIMM kit?

The system needs four free 240-pin DDR2 slots that support 1.8 V unbuffered non-ECC memory and dual-channel operation for the matched 4 x 1 GB configuration.

Will the CL4 533 MHz sticks down-clock automatically if the motherboard only supports slower DDR2 speeds?

Yes — JEDEC-compliant DDR2 modules negotiate the highest common speed with the memory controller, so they will run at the board's maximum supported rate without manual setup.

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