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

Computer Memory Solutions

Computer Memory Solutions CM5126412800DIMM 4GB DDR3 1600MHz Dell Vostro 3900 memory upgrade

SKU CH-7KSK-YGF3G

4GB DDR3 1600MHz DIMM for Dell Vostro 3900, CL11 timing, 1.5V unbuffered non-ECC

  • Total capacity4 GB
  • Rated speedDDR3 1600 (PC3 12800)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL11
  • Memory timings11-11-11
  • Rated voltage1.5 V
  • 4GB capacity expands Vostro 3900 to 16GB maximum
  • 1600MHz DDR3 speed matches PC3-12800 system bus
  • CL11 11-11-11 timing keeps latency low
  • 5V unbuffered design installs without BIOS changes
  • Major-brand chipset validated for Dell A73 compatibility

Dell Vostro 3900 4GB DDR3 upgrade

This 4GB DDR3 1600MHz module is built specifically for the Dell Vostro 3900 desktop. It uses a 240-pin DIMM form factor with a 1Rx8 rank configuration and runs at 1.5V. The non-ECC, unbuffered design matches the original system requirements for a direct drop-in installation.

CL11 11-11-11 timing under load

The module operates at CL11 with 11-11-11 timings at the rated 1600MHz speed. Major brand chipsets are used to maintain stability during sustained workloads rather than only brief bursts. The absence of a heat spreader relies on the chassis airflow of the Vostro 3900 to keep temperatures in check over long sessions.

Expands from 2-slot 16GB ceiling

The Vostro 3900 provides two memory sockets with a maximum supported capacity of 16GB on a 64-bit operating system. Adding this single 4GB stick increases total memory without occupying both slots, leaving room for a second module later. Buyers who need more than 16GB total capacity or who require ECC error correction cannot use this kit.

How it compares

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

Price $10.99
Cheaper than about 96% of the 21,161 comparable items (median $397.99).
Total capacity 4 GB
Lower than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $2.75 per GB
Cheaper than about 91% of the 20,941 comparable items (median $8.19 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 nameComputer Memory Solutions
Model nameCM5126412800DIMM
Total capacity4 GB
Product type240-Pin DDR3 SDRAM
Performance
Rated speedDDR3 1600 (PC3 12800)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL11
Memory timings11-11-11
ECC supportNo
Buffer typeUnbuffered
Memory rank1Rx8
Heat spreaderNo
Power
Rated voltage1.5 V
Compatibility
Compatible systemsDell Vostro 3900
In the box
Included items1 Memory RAM Stick

Questions about this item

Does this 1.5V DDR3 module run cool and quiet during all-day use in a Vostro 3900?

The stick uses standard 1.5V DDR3 with no heat spreader; it relies on case airflow and adds negligible heat or noise inside the chassis.

What must the Vostro 3900 already have for this 240-pin DIMM to install and work?

A free DDR3 DIMM slot — the system supports two slots and up to 16GB total with a 64-bit OS — and the board must accept non-ECC unbuffered memory.

Will this CL11 1600MHz stick work alongside the original memory in a Vostro 3900?

Yes — it matches the Dell-qualified PC3-12800 1600MHz spec, so the system will run both modules at the supported speed and timings.

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