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Two green DDR3 DIMM sticks with black chips no heat spreader

Computer Memory Solutions

Computer Memory Solutions 16GB (2x8GB) DDR3 1600MHz CL11 240-Pin DIMM Dell Optiplex 790 USFF memory upgrade

SKU CH-RHAR-TWXWJ

16 GB dual-channel DDR3-1600 kit with CL11 timing for Dell Optiplex 790 USFF desktops

  • Total capacity16 GB (2 × 8 GB)
  • Rated speedDDR3 1600 (PC3 12800)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL11
  • Memory timings11-11-11
  • Rated voltage1.5 V
  • 16 GB dual-channel kit boosts multitasking headroom
  • 1600 MHz DDR3 speed matches OptiPlex 790 USFF spec
  • CL11 1.5 V timing keeps latency low
  • 240-pin unbuffered DIMMs install in both factory slots
  • CMS lifetime warranty backs long-term reliability

Optiplex 790 USFF DDR3 Kit

This 16GB kit uses two 8GB DDR3 modules built for the Dell Optiplex 790 USFF desktop. It raises the system to its 16GB maximum across the two available slots. The memory is non-ECC and unbuffered, matching the platform requirements.

1.5V Operation at CL11

Each module runs at 1.5V with a CAS latency of 11 and 11-11-11 timing at 1600MHz. Standard JEDEC voltage keeps power draw low and thermals modest inside the small-form-factor chassis. No heat spreaders are fitted, relying on case airflow.

240-Pin DIMM Pair for Two Slots

The 240-pin DIMM form factor fits the Optiplex 790 USFF motherboard directly. A matched pair enables dual-channel operation without manual configuration. Builders needing ECC, registered modules or speeds above 1600MHz should choose a different product.

How it compares

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

Price $39.99
Cheaper than about 80% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB (2 × 8 GB)
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $2.50 per GB
Cheaper than about 92% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameComputer Memory Solutions
Model nameCM10246412800DIMM
Total capacity16 GB (2 × 8 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 rank2Rx8
Heat spreaderNo
Power
Rated voltage1.5 V
Compatibility
Compatible systemsDell Optiplex 790 Usff Dekstop
In the box
Included items2 Memory RAM Sticks

Questions about this item

How do I install the 240-pin DDR3 DIMMs in the Dell Optiplex 790 USFF, and what step is often missed?

Power off and unplug the USFF, open the chassis, align each 240-pin module with the two DDR3 slots, press firmly until the retention clips click on both sides, then verify 16 GB appears in BIOS — the step often missed is seating both clips fully on each 8 GB stick.

What maintenance or replacement will the 16 GB kit need later?

The unbuffered non-ECC DDR3 modules have no moving parts or batteries; they require no scheduled maintenance, and replacement is only necessary if a stick fails or the system is upgraded beyond the 16 GB two-slot maximum.

What limit appears first under sustained use with these CL11 1.5 V modules?

The platform caps at 16 GB across two slots, so capacity is the first hard limit; thermal throttling is unlikely because the USFF airflow and standard 1.5 V JEDEC voltage keep the 2Rx8 chips within spec during continuous workloads.

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