Dell OptiPlex 990 Ultra SFF Memory Upgrades ✓­ Guaranteed Compatible

Learn more about Dell OptiPlex 990 Ultra SFF memory

What Dell OptiPlex 990 Ultra SFF DIMM type is supported?

UDIMM

Why are there various DIMM types supported?

Factory configured 990 Ultra SFF systems often have smaller, less expensive modules. As more memory is required different density and technologies are needed. DIMM type mixing is never recommended.

What is an unbuffered memory module?

Unbuffered, non-registered DIMM memory modules have no buffer/register component between the DRAM modules and the motherboard memory controller.

What Dell OptiPlex 990 Ultra SFF memory speed is supported?

DDR3-1333

Why may there be various speeds of Dell OptiPlex 990 Ultra SFF memory?

Some servers often have various configurations and versions. If you are unsure what you need, please refer to your 990 Ultra SFF manual or data sheet. If you need tech support, please contact us.

General DIMM population guideline for Dell OptiPlex 990 Ultra SFF upgrade to consider.

Some may or may not apply.

• Install DIMMs starting furthest from the processor.
• Do not install DIMMs if the corresponding processor is not installed.
• If only one processor is installed in a two CPU system, only half of the DIMM slots are available.
• To maximize performance, balance the total memory capacity between all installed processors.
• It is not required, but it is recommended to load the channels similarly if possible.

Why are there so many Dell OptiPlex 990 Ultra SFF upgrade options?

IT buyers come from all walks of life. Some purchase by OEM part number. Some purchase by original module part number. Our goal is to give you confidence when purchasing Dell OptiPlex 990 Ultra SFF upgrades. All modules listed are qualified to work in your Dell OptiPlex 990 Ultra SFF.