Dell OptiPlex 755 User Manual
Page 12
version 1.0
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Dell™ optiplex™ 755 technical guiDe
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DDR2 Synch DRAM Non-ECC Memory 667MHz or 800MHz speeds
DIMM Slots
4
4
4
2
DIMM Capacities
Up to 2GB
Up to 2GB
Up to 2GB
Up to 2GB
Minimum Memory
512MB
512MB
512MB
512MB
Maximum Memory with 667MHz Speed Memory
8GB
1
8GB
1
8GB
1
4GB
1
Maximum Memory with 800MHz Speed Memory
8GB
1
8GB
1
8GB
1
4GB
1
Configurations:
800MHz Memory Configurations
4GB
1
DDR2 Non-ECC SDRAM, 800MHz,
(2 DIMM)
✓
✓
✓
✓
4GB
1
DDR2 Non-ECC SDRAM, 800MHz,
(4 DIMM)
✓
✓
✓
2GB DDR2 Non-ECC SDRAM, 800MHz,
(1DIMM)
✓
✓
✓
✓
2GB DDR2 Non-ECC SDRAM, 800MHz,
(2 DIMM)
✓
✓
✓
✓
1GB DDR2 Non-ECC SDRAM, 800MHz,
(1 DIMM)
✓
✓
✓
✓
667MHz Memory Configurations
4GB
1
DDR2 Non-ECC SDRAM, 667MHz,
(4 DIMM)
✓
✓
✓
4GB
1
DDR2 Non-ECC SDRAM, 667MHz,
(2 DIMM)
✓
✓
✓
✓
3GB DDR2 Non-ECC SDRAM, 667MHz,
(4 DIMM)
✓
✓
✓
2GB DDR2 Non-ECC SDRAM, 667MHz,
(4 DIMM)
✓
✓
✓
2GB DDR2 Non-ECC SDRAM, 667MHz,
(2 DIMM)
✓
✓
✓
✓
1GB DDR2 Non-ECC SDRAM, 667MHz,
(2 DIMM)
✓
✓
✓
✓
1GB DDR2 Non-ECC SDRAM, 667MHz,
(1 DIMM)
✓
✓
✓
✓
512MB DDR2 Non-ECC SDRAM, 667MHz,
(1 DIMM)
✓
✓
✓
✓
MEMory
Your computer supports a maximum of 8GB of memory when you use four 2GB DIMMs; however, 32-bit operating systems, such as the
32-bit version of Microsoft
®
Windows
®
XP, can only use a maximum of 4GB 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.
The entire 8GB 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.
1
The total amount of available memory will be less, depending on actual system configuration.