Specifications

DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK —VERSION 1.5
13
MEMORY
NOTE: Memory modules should be installed in pairs of matched memory size, speed, and technology. If the memory modules
are not installed in matched pairs, the computer will continue to operate, but with a slight reduction in performance. The entire
16GB memory range is available to 64-bit operating systems.
1
The total amount of available memory will be less than 4GB. The amount less depends on the actual system configuration. To fully utilize 4GB or
more of memory requires a 64-bit enabled processor and 64-bit operating system.
MT DT SFF USFF
Type: DDR3 Synch DRAM Non-ECC Memory 1333MHz
DIMM Slots 4 4 4 2
DIMM Capacities Up to 4GB Up to 4GB Up to 4GB Up to 4GB
Minimum Memory 1GB 1GB 1GB 1GB
Maximum System Memory 16GB
1
16GB
1
16GB
1
8GB
1
Memory configurations
16GB
1
DDR3, 1333MHz, (4 DIMM) X X X
8GB
1
DDR3, 1333MHz, (2 DIMM) X X X X
4GB
1
DDR3, 1333MHz, (2 DIMM) X X X
4GB
1
DDR3, 1333MHz, (1 DIMM) X
3GB DDR3, 1333MHz, (2 DIMM) X X X X
2GB DDR3, 1333MHz, (1 DIMM)
X
1GB DDR3, 1333MHz, (1 DIMM) X X X X
2GB DDR3, 1333MHz, (2 DIMM) X X X