Dell 980 manual Minimum Memory, Maximum Memory with 1333MHz speed memory

Memory

Your computer supports a maximum of 16 GB of memory when you use four 4-GB DIMMs; however, 32-bit operating systems, such as the 32-bit version of Microsoft® Windows® XP, can only use a maximum of 4 GB of address space. Moreover, certain components within the computer require address space in the 4GB range. Any address space reserved for these components cannot be used by computer memory; therefore, the amount of memory available to the operating system is less than 4GB.

NOTE: The entire 16-GB memory range is available to 64-bit operating systems.

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.

	MT	DT	SFF
Type: DDR3 Synch DRAM Non-ECC Memory
DIMM Slots	4	4	4
DIMM Capacities	Up to 16GB	Up to 16GB	Up to 16GB
Minimum Memory	1GB	1GB	1GB
Maximum Memory with 1333MHz speed memory	16GB1	16GB1	16GB1
Configurations:
1333MHz Memory configurations
16GB1 DDR2 Non-ECC SDRAM, 1333MHz, (4 DIMM)	X	X	X
8GB1 DDR2 Non-ECC SDRAM, 1333MHz, (4 DIMM)	X	X	X
8GB1 DDR2 Non-ECC SDRAM, 1333MHz, (2 DIMM)	X	X	X
4GB1 DDR2 Non-ECC SDRAM, 1333MHz, (4 DIMM)	X	X	X
4GB1 DDR2 Non-ECC SDRAM, 1333MHz, (2 DIMM)	X	X	X
4GB1 DDR2 Non-ECC SDRAM, 1333MHz, (1 DIMM)	X	X	X
3GB DDR2 Non-ECC SDRAM, 1333MHz, (3 DIMM)	X	X	X
2GB DDR2 Non-ECC SDRAM, 1333MHz, (2 DIMM)	X	X	X
2GB DDR2 Non-ECC SDRAM, 1333MHz, (1 DIMM)	X	X	X
1GB DDR2 Non-ECC SDRAM, 1333MHz, (1 DIMM)	X	X	X

1The 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.

OptiPlex 980 Technical Guidebook Page 13