Dell R220 owner manual General Memory Module Installation Guidelines, Sample Memory Configurations

channel 1: memory sockets 1 and 3

channel 2: memory sockets 2 and 4

The following table shows the memory populations and operating frequencies for the supported configurations.

DIMM Type	DIMMs Populated/	Operating Frequency (in	Maximum DIMM Rank/
	Channel	MT/s)	Channel
		1.35 V
UDIMM ECC	1	1333, 1600	Dual rank
	2	1333, 1600	Dual rank

General Memory Module Installation Guidelines

NOTE: Memory configurations that fail to observe these guidelines can prevent your system from booting, hanging during memory configuration, or operating with reduced memory.

This system supports Flexible Memory Configuration, enabling the system to be configured and run in any valid chipset architectural configuration. The following are the recommended guidelines for best performance:

•x4 and x8 DRAM based DIMMs can be mixed.

•Populate all sockets with white release tabs first, and then black.

•Populate the sockets by highest rank count in the following order – first in sockets with white release levers, and then black. For example, if you want to mix quad-rank and dual-rank DIMMs, populate quad-rank DIMMs in the sockets with white release tabs and dual-rank DIMMs in the sockets with black release tabs.

•Memory modules of different sizes can be mixed provided that other memory population rules are followed (for example, 4 GB and 8 GB memory modules can be mixed).

•If memory modules with different speeds are installed, they will operate at the speed of the slowest installed memory module(s) or slower depending on system DIMM configuration.

Sample Memory Configurations

The following table shows sample memory configurations that follow the appropriate memory guidelines stated in this section.

NOTE: Minimum supported memory is 4 GB and maximum supported memory is 32 GB.

NOTE: 1R and 2R in the following table indicates single- and dual-rank DIMMs respectively.

Table 1. Memory Configurations

System Capacity	DIMM Size (in	Number of	DIMM Rank, Organization,	DIMM Slot
(in GB)	GB)	DIMMs	and Frequency	Population
4	4	1	1R, x8, 1333 MT/s,	1
			1R, x8, 1600 MT/s
8	4	2	1R, x8, 1333 MT/s,	1, 2
			1R, x8, 1600 MT/s
16	4	4	2R, x4, 1333 MT/s,	1, 2, 3, 4

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