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Green 240-pin DDR3 DIMM stick, no heat spreader

Computer Memory Solutions

Computer Memory Solutions CM5126412800DIMM 4GB DDR3 1600MHz Dell Optiplex 990 USFF memory upgrade

SKU CH-SCBV-8RKJP

4GB DDR3 1600MHz module upgrades Dell Optiplex 990 USFF systems with CL11 timing and 1.5V operation

  • Total capacity4 GB
  • Rated speedDDR3 1600 (PC3 12800)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL11
  • Memory timings11-11-11
  • Rated voltage1.5 V
  • Guaranteed Dell Optiplex 990 USFF fit
  • 4 GB DDR3 1600 MHz module expands capacity
  • CL11 1.5 V timing for stable operation
  • Single 240-pin unbuffered DIMM installs easily
  • Lifetime exchange warranty from Computer Memory Solutions

System-Specific DDR3 Upgrade for OptiPlex 990 USFF

This 4 GB DDR3 module is built for the Dell OptiPlex 990 Ultra Small Form Factor. It runs at 1600 MHz with CL11 timing and 1.5 V unbuffered, non-ECC operation. The single 240-pin DIMM uses a 1Rx8 rank configuration and major-brand chips. Computer Memory Solutions guarantees compatibility with the listed system.

Verify Your OptiPlex 990 USFF Configuration

Confirm the motherboard has a free 240-pin DDR3 slot before ordering. The platform supports up to 8 GB total with a 64-bit operating system, but only 4 GB with a 32-bit OS. Ensure the installed OS matches the capacity you intend to use. This module is not ECC or registered, so it must match the existing memory type in the machine.

Ideal for Single-Slot Capacity Refresh

Suits owners of a Dell OptiPlex 990 USFF who need a straightforward 4 GB replacement or addition. Buyers requiring ECC error correction, registered buffering, higher densities per slot, or a different DDR generation should look elsewhere. The module is also unsuitable for systems that only accept low-profile or SODIMM form factors.

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).

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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 Optiplex 990 Ultra Small Form Factor
In the box
Included items1 Memory RAM Stick

Questions about this item

Does the CM5126412800DIMM kit include any cables, brackets or tools for installation in the Dell Optiplex 990 USFF?

The package contains one 4GB DDR3 1600MHz 240-pin DIMM module only. No cables, brackets or tools are included.

Should I choose the 4GB module if my Optiplex 990 USFF runs a 64-bit operating system?

A 64-bit system supports up to 8GB total across the two slots. This single 4GB stick leaves one slot free for a matching module later.

Will the PC3-12800 rating run at 1600MHz once installed in the Optiplex 990 USFF?

Yes. The module is rated DDR3-1600 (PC3-12800) with CL11 timing at 1.5V and will operate at that speed in the supported system.

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