Dell PowerEdge 2550 - Manual (Page 67)

10. Replace the expansion-card cage in the chassis (see " Removing and Replacing the Expansion-Card Cage " in "Checking Inside the System").
11. Close the system doors, reconnect the system and peripherals to their electrical outlets, and turn them on.
Adding Memory
The four dual in-line memory module (DIMM) sockets on the system board (see Figure 8 -1 ) can accommodate from 128 megabytes (MB) to 4 gigabytes (GB) of
registered synchronous dynamic random-access memory (SDRAM).
Memory Upgrade Kits
The system is upgradable to 4 GB by installing combinations of 64-,128- 256-, 512-MB, or 1-GB registered memory modules. You can purchase memory
upgrade kits from Dell as needed.
Memory Module Installation Guidelines
Starting with the socket nearest to the system power supply (or supplies), the memory module sockets are labeled "DIMM_A" through "DIMM_D" (see
Figure 8 -4 ). When you install memory modules, follow these guidelines:
l You must install memory modules in matched pairs.
l Install a pair of memory modules in socket DIMM_A and DIMM_B before installing a second pair in sockets DIMM_C and DIMM_D.
l If you install different-sized pairs of memory modules, install them in order of descending capacity, beginning with the highest-capacity memory modules
in sockets DIMM_A and DIMM_B.
Figure 8-4. Memory Module Sockets
Table 8 -2 illustrates several sample memory configurations based on these guidelines.
Table 8-2. Sample Memory Module Configurations
Performing a Memory Upgrade
To perform a memory upgrade to the system board, perform the following steps.
NOTE: The memory modules must be PC-133 compliant.
Total Desired Memory Memory Module Sockets
DIMM_A DIMM_B DIMM_C DIMM_D
128 MB 64 MB 64 MB none none
256 MB 128 MB 128 MB none none
512 MB 256 MB 256 MB none none
1 GB 256 MB 256 MB 256 MB 256 MB
4 GB 1 GB 1 GB 1 GB 1 GB
WARNING: Before you perform this procedure, you must turn off the system and disconnect it from its electrical outlet. For more information, see
"
Safety First—For You and Your Computer " in "Checking Inside the System."