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Green rectangular circuit board with gold edge connectors and black memory chips

DELL

DELL DDR2 533MHz 1GB PC2-4200E ECC Laptop RAM HYS72T128020HU-3.7-A

SKU CH-NH4M-X9JD0

1 GB DDR2 ECC laptop memory module running at 533 MHz, validated for Dell PowerEdge and Precision systems

  • 1GB DDR2 ECC memory adds capacity to compatible Dell systems
  • 533MHz PC2-4200E speed matches original Dell specifications
  • ECC error correction protects data integrity in servers and workstations
  • Gold leads ensure reliable electrical contact in the slot
  • Tested working pull from Dell PowerEdge and Precision systems

Dell DDR2 533MHz ECC module

This is a 1GB DDR2 ECC memory stick rated at PC2-4200E and 533MHz. It carries gold leads and the part number HYS72T128020HU-3.7-A from the manufacturer Qimonda. The module is a working pull taken from a tested Dell system and sold as new-old-stock. It fits laptop or server slots that accept DDR2 ECC SO-DIMMs.

Suits owners of listed Dell Precision

Builders maintaining a Precision 490, 690, T5400, T7400, R5400 or a PowerEdge 1900, 1950, 1955, 2900, 2950, M600, R900, SC1430 can use this stick for a direct replacement or capacity upgrade. Systems that require non-ECC memory, faster DDR2 speeds or larger single-module capacities cannot use this part.

1GB ECC at PC2-4200E is the deciding spec

The module delivers exactly 1GB of DDR2 ECC memory at 533MHz PC2-4200E. If your hardware demands ECC and accepts this speed grade, the stick will work; if the platform needs non-ECC, higher frequency or a different density, it will not.

Highlights

  • 1GB DDR2 ECC memory adds capacity to compatible Dell systems
  • 533MHz PC2-4200E speed matches original Dell specifications
  • ECC error correction protects data integrity in servers and workstations
  • Gold leads ensure reliable electrical contact in the slot
  • Tested working pull from Dell PowerEdge and Precision systems

Specifications

BrandDell

Questions about this item

Does the 72-pin gold-lead SO-DIMM fit the DDR2 slots in a PowerEdge 1950 or Precision 690?

Yes — the module is a 72-pin DDR2 SO-DIMM with gold leads, matching the slot type used in the listed PowerEdge and Precision systems.

What is the correct way to seat the module so the ECC function works?

Align the notch with the key in the slot, press firmly until both side clips click, then verify in BIOS that the full 1 GB is detected and ECC is enabled.

When should the HYS72T128020HU-3.7-A stick be replaced?

Replace it if memory diagnostics report uncorrectable errors, the OS logs repeated corrected ECC events, or the system fails to start with the module installed.

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