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Green circuit board with black memory chips and gold edge connector

OWC

OWC 4GB DDR3 1333 PC3-10600 CL9 1Rx8 240-pin 1.5V Non-ECC UDIMM memory upgrade for Dell OptiPlex 990

SKU CH-7BWW-QGHF5

Adds 4 GB of DDR3-1333 memory to compatible Dell OptiPlex 990 desktops

  • Total capacity4 GB
  • Rated speedDDR3 1333 (PC3 10600)
  • CAS latencyCL9
  • Rated voltage1.5 V
  • Buffer typeUnbuffered
  • Memory rank1Rx8
  • Adds 4GB of DDR3 memory for smoother multitasking
  • Runs at 1333MHz CL9 for responsive desktop performance
  • 5V unbuffered design keeps power draw low
  • JEDEC-standard build ensures warranty-safe operation
  • Fits Dell OptiPlex 990 Desktop, SFF, Tower and USFF

OWC 4 GB DDR3 module for Dell OptiPlex 990

This single 4 GB DDR3 1333 UDIMM is built to upgrade Dell OptiPlex 990 Desktop, SFF, Tower and USFF systems. It runs at 1.5 V with CL9 latency and uses a standard 240-pin unbuffered layout. The module is JEDEC and RoHS compliant for a warranty-safe installation.

Ideal for owners adding memory to a compatible

Buyers whose systems require ECC, registered DIMMs or a different pin count cannot use this module. It also suits only DDR3 platforms, so machines limited to other memory generations are not supported.

Deciding spec: 240-pin DDR3 1333 UDIMM at 1.5 V

If the target computer accepts a 240-pin DDR3 1333 PC3-10600 CL9 unbuffered DIMM at 1.5 V, this 4 GB stick will fit and function. Any other pin layout, voltage or speed standard means the part is incompatible.

How it compares

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

Price $19.99
Cheaper than about 91% 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 $5.00 per GB
Cheaper than about 77% 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 nameOWC
Part number1U3D31R804 GB
Total capacity4 GB
Product type240-Pin DDR3 Non-ECC UDIMM
Performance
Rated speedDDR3 1333 (PC3 10600)
Memory
CAS latencyCL9
ECC supportNo
Buffer typeUnbuffered
Memory rank1Rx8
Heat spreaderNo
Power
Rated voltage1.5 V
Compatibility
Compatible systemsDell OptiPlex 990 Desktop
Dell OptiPlex 990 SFF
Dell OptiPlex 990 Tower
Dell OptiPlex 990 USFF

Other versions of this model

5 more in the same range

Questions about this item

Does my Dell OptiPlex 990 need a free 240-pin DIMM slot to install this 4GB DDR3 1333 module?

Yes, this UDIMM fits a standard 240-pin DDR3 slot on any OptiPlex 990 Desktop, SFF, Tower or USFF motherboard.

Can I keep my existing PC3-10600 CL9 sticks and add this 1Rx8 1.5V module alongside them?

It will work if the other modules are also DDR3 1333 non-ECC unbuffered; mixing ranks or speeds may force the system to run at the lowest common speed.

How can I confirm the 4GB upgrade is recognised at 1333 MHz after installation?

Check the BIOS memory information screen or run CPU-Z; both should show 4GB at PC3-10600 1333 MHz CL9.

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