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Two green DDR2 SO-DIMM sticks with gold contacts

OWC

OWC 4GB (2x2GB) DDR2 533 PC2-4200 CL4 200-pin laptop RAM

SKU CH-042E-2MW0K

Dual-channel 4 GB DDR2 533 kit with two 2 GB SO-DIMMs at CL4 and 1.8 V for compatible laptops and all-in-one systems

  • Total capacity4 GB (2 × 2 GB)
  • Rated speedDDR2 533 (PC2 4200)
  • CAS latencyCL4
  • Rated voltage1.8 V
  • Buffer typeUnbuffered
  • Kit configurationDual Channel Kit
  • Dual-channel kit doubles bandwidth with two matched 2GB modules
  • JEDEC-standard DDR2 533 CL4 ensures broad laptop compatibility
  • 8V unbuffered non-ECC design fits standard 200-pin SO-DIMM slots
  • Tested to meet OEM specs for reliable multitasking performance
  • Cost-effective 4GB upgrade extends usable life of older systems

Compatible upgrade kit for DDR2 laptops

This OWC kit supplies two 2 GB DDR2 533 SO-DIMM modules for a total of 4 GB. It targets owners of older laptops, all-in-one PCs or compatible NAS units that accept 200-pin PC2-4200 memory. The dual-channel pair is designed to match factory specifications for a straightforward capacity increase.

Verify slot count and maximum supported memory

Before ordering, confirm that your system uses 200-pin DDR2 SO-DIMM slots and can address 4 GB in total. Check the manufacturer documentation for the maximum capacity per slot and whether the BIOS requires matched pairs. The modules run at 1.8 V with CL4 latency and are unbuffered, non-ECC parts.

JEDEC-compliant modules with lifetime support

Each stick is tested to meet JEDEC and RoHS standards, ensuring a warranty-safe upgrade without voltage or timing surprises. OWC backs the kit with a limited lifetime warranty and free technical support, while the dual-channel configuration helps the memory controller operate at its rated bandwidth. No heat spreaders or extra software are included.

How it compares

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

Price $32.99
Cheaper than about 70% of the 2,079 comparable items (median $70.99).
Total capacity 4 GB (2 × 2 GB)
Lower than about 80% of the 1,886 comparable items (median 16 GB).
Price per GB $8.25 per GB
Pricier than about 71% of the 1,886 comparable items (median $5.94 per GB).

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Specifications

Product
Brand nameOWC
Part number4S2D22R8004P
Total capacity4 GB (2 × 2 GB)
Product type200-Pin DDR2 SO-DIMM
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 forLaptops, All-in-One Systems, and NAS Systems

Questions about this item

Does the kit include anything besides the two 2 GB DDR2 SODIMMs?

The upgrade kit contains two 200-pin DDR2 533 CL4 modules rated at 1.8 V and nothing else.

Should I choose this dual-channel kit or look for a single 4 GB stick?

The matched pair is designed for dual-channel laptops and all-in-ones, giving the full 4 GB across two slots with identical timing.

What does the PC2-4200 label mean for actual throughput once installed?

PC2-4200 indicates a peak transfer rate of 4 200 MB/s at 533 MT/s, the standard ceiling for DDR2 533 modules.

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