We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
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

  • Capacity4GB (4 x 1GB)
  • SpeedDDR2 533 (PC2 4200)
  • CAS LatencyCL4
  • Voltage1.8V
  • ECCNo
  • Buffered/RegisteredUnbuffered

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.

Highlights

  • 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

Specifications

BrandOWC
Part Number4U2D21R8004S
Capacity4GB (4 x 1GB)
SpeedDDR2 533 (PC2 4200)
CAS LatencyCL4
Voltage1.8V
ECCNo
Buffered/RegisteredUnbuffered
Multi-channel KitDual Channel Kit
ColorBlack
Heat SpreaderNo
Recommend UseDesktops
LED ColorNone

Other versions of this model

4 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

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.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.