Memory, Fully buffered dimm (fbd) memory overview, Memory" on – Dell Precision T5400 (Late 2007) User Manual
Page 187
Adding and Replacing Parts
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15 Ensure that all connectors are properly cabled and firmly seated.
16 Rotate the hard-drive carrier back into place (see "Rotating the Hard-Drive
Carrier Back into the Computer" on page 159).
17 Replace the computer cover (see "Replacing the Computer Cover" on
NOTICE:
To connect a network cable, first plug the cable into the network port or
device and then plug it into the computer.
18 Connect the computer and devices to electrical outlets, and turn them on.
Memory
Your computer supports fully-buffered ECC DDR2 memory only. For more
information on the type of memory supported by your computer, see
NOTICE:
Before you install new memory modules, download the most recent BIOS
for your computer from the Dell Support website at support.dell.com.
NOTE:
Memory purchased from Dell is covered under your computer warranty.
Fully Buffered DIMM (FBD) Memory Overview
For optimal performance, fully buffered DIMMs (FBDs) should be installed
in matched sets of four. This enables quad-channel operation and provides
the highest memory bandwidth. The sets of four must be matched in size,
rank, and organization. This information can normally be found on the FBD
label. For example, the label of each FBD in a set of four might read: 1G 2R
x8, in which 1G represents the size of the memory module, 2R represents the
number of ranks, and x8 represents the organization.
NOTICE:
Full-length heat spreaders (FLHS) are required for 667 MHz DIMMs.