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Green circuit board with black memory chips and gold edge connectors

DELL

DELL XG691 1GB DDR2 DIMM 800MHz PC2-6400U desktop RAM

SKU CH-XYK2-7JJGH

Adds 1 GB of DDR2 desktop memory at 800 MHz PC2-6400U in a DIMM module

  • Total capacity16 GB
  • 1 GB DDR2 capacity upgrades legacy desktops
  • 800 MHz DDR2 speed supports PC2-6400U bandwidth
  • 2Rx8 dual-rank organisation improves memory throughput
  • DIMM form factor fits standard desktop slots
  • NECC non-ECC design suits consumer platforms

Dell XG691 DDR2 Memory Module

This Dell XG691 module adds 1GB of DDR2 memory to a desktop PC. It runs at 800MHz under the PC2-6400U standard and uses a standard DIMM form factor. The unit is non-ECC and built with a 2Rx8 rank configuration.

Suitable for owners of legacy desktops needing

This module fits systems that accept PC2-6400U DDR2 DIMMs and have a free slot. It is not for owners of boards that require ECC memory, nor for anyone whose platform only accepts a different memory generation or form factor. Capacity seekers should note the 1GB limit per module.

The PC2-6400U 800MHz DDR2 specification decides fit

Match this exact speed and standard against your motherboard manual before ordering. The 128X64 rank layout and non-ECC design must also align with the board requirements. If the manual lists a different DDR2 speed or requires ECC, this part will not work.

How it compares

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

Price $6.99
Cheaper than about 99% of the 3,647 comparable items (median $90.99).
Total capacity 16 GB
Typical for this category: the median of 3,251 items is 16 GB.
Price per GB $0.44 per GB
Cheaper than about 99% of the 3,251 comparable items (median $6.75 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 nameDell
Model nameXG691
Part numberXG691
Total capacity16 GB

Questions about this item

Will the 1 GB DDR2 module run at its rated 800 MHz speed continuously without throttling?

The module is specified for PC2-6400U at 800 MHz. Sustained operation at that data rate is within its rated limits; thermal throttling is not a published constraint for this part.

How much heat and noise does the XG691 add when the system runs all day?

As a passive DDR2 DIMM the module generates only modest heat and no audible noise. Typical case airflow is sufficient for continuous operation.

What existing hardware must I already have for this 128X64 ranked DIMM to function?

A desktop motherboard with DDR2 DIMM slots that accepts PC2-6400U non-ECC memory is required. The board must support 1 GB unbuffered modules.

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