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Two green DDR2 DIMM modules with black chips, no heat spreaders

Computer Memory Solutions

Computer Memory Solutions 4GB (2x2GB) DDR2 800MHz CL6 Non-ECC DIMM Dell OptiPlex 755

SKU CH-7NAZ-TQZE9

A 4 GB matched pair of DDR2 800 MHz CL6 unbuffered DIMMs built for Dell OptiPlex 755 desktops

  • Total capacity4 GB (2 × 2 GB)
  • Rated speedDDR2 800 (PC2 6400)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL6
  • Memory timings6-6-6
  • Rated voltage1.8 V
  • 4GB total capacity in a matched 2 x 2GB kit
  • DDR2 800MHz (PC2-6400) CL6 timing for responsive operation
  • 240-pin unbuffered non-ECC DIMM fits Dell OptiPlex 755 DT/MT/SFF
  • 8V standard voltage with major-brand chipset for stable performance
  • Guaranteed compatibility with lifetime warranty from Computer Memory Solutions

Targeted DDR2 upgrade for Dell OptiPlex 755

This 4 GB kit delivers two matched 2 GB DIMMs built to the PC2-6400 800 MHz CL6 specification. It is engineered for the OptiPlex 755 desktop, mini-tower and small-form-factor chassis. The modules are non-ECC, unbuffered and operate at the standard 1.8 V DDR2 voltage.

Steady throughput at rated speed

Running at the full 800 MHz data rate with 6-6-6 timings, the pair maintains its CL6 latency during extended workloads rather than throttling after a short burst. The 2Rx8 organisation and major-brand chipset keep bandwidth consistent across the four or two slots populated in the host system.

Plain green PCB fits tight spaces

Without a heat spreader the low-profile sticks clear cramped SFF interiors and sit cleanly in 240-pin slots. The standard notch alignment prevents mis-insertion, and the two-piece kit lets you populate matching channels for dual-channel operation where the motherboard supports it.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $17.99
Cheaper than about 92% of the 21,161 comparable items (median $397.99).
Total capacity 4 GB (2 × 2 GB)
Lower than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $4.50 per GB
Cheaper than about 81% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameComputer Memory Solutions
Model nameCM256646400DIMMDR
Total capacity4 GB (2 × 2 GB)
Product type240-Pin DDR2 SDRAM
Performance
Rated speedDDR2 800 (PC2 6400)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL6
Memory timings6-6-6
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.8 V
Compatibility
Compatible systemsDell Optiplex 755 Dt / Mt / Sff
In the box
Included items2 Memory RAM Sticks

Questions about this item

How much power does the DDR2 800 CL6 kit draw when the Dell OptiPlex 755 runs all day?

The modules run at 1.8 V with no heat spreader, so power draw stays low and cooling relies on normal chassis airflow.

What must the Dell OptiPlex 755 already have for these 240-pin DIMMs to work?

The desktop needs two free 240-pin DDR2 slots and a motherboard that supports PC2-6400 800 MHz non-ECC unbuffered memory.

Will this 4 GB kit work alongside the original 2 GB sticks still in my OptiPlex 755?

Yes, if the board has four slots you can add this 2×2 GB kit to the existing pair, but total memory must not exceed the 8 GB or 4 GB limit for your chassis.

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