Dell PRECISION WORKSTATION 620 manual Rimm Installation Guidelines

RIMM Installation Guidelines

You must install RIMMs in pairs. This means that the RIMM in each socket on one MEC must be the same memory capacity, density, and speed as the corresponding RIMM in the same socket on the other MEC. Also, for either channel A or B of each MEC, if one socket contains a RIMM, then the other socket must contain either another RIMM or a continuity RIMM (CRIMM).

As an example, if you install only one pair of RIMMs in the RIMM1_A socket of each MEC, then you must install a CRIMM in socket RIMM2_A of each MEC. Channel B (sockets RIMM3_B and RIMM4_B) may remain empty, or it may contain one or two CRIMMs per MEC (see Figure 1-1).

However, if channel A contains two RIMMs and you want to install additional RIMMs, the preceding rules also apply for channel B.

NOTES: If 512-MB RIMMs are used, they must be populated starting with the bottom RIMM socket (RIMM4_B, the one closest to the system board) and working up. For example, see the configuration in the last row in Table 1-1. In this example, you would insert the 512-MB RIMMs into the bottom three sockets (RIMM4_B, RIMM3_B, RIMM2_A) and insert a CRIMM into the topmost socket (RIMM1_A).

When you add 512-MB RIMMs from a customer kit, you must remove all existing RIMMs and reinstall the new 512-MB RIMMs, beginning with socket RIMM4_B and working up on each riser board in mirror fashion.

Dell does not recommend or support the mixing of old and new 512-MB RIMMs in sockets RIMM1_A and RIMM2_A.

Table 1-1. Sample Factory-Installed RIMM Configurations (per MEC)

For Total

Desired

Memory:

Populate both MECs as follows:

			RIMM4_B
RIMM1_A (top)	RIMM2_A	RIMM3_B	(bottom)

128 MB	CRIMM	64 MB	Empty	Empty
256 MB	CRIMM	128 MB	Empty	Empty
384 MB	128 MB	64 MB	CRIMM	Empty
512 MB	128 MB	128 MB	CRIMM	Empty
512 MB	CRIMM	256 MB	Empty	Empty
768 MB	256 MB	128 MB	CRIMM	Empty
1024 MB	128 MB	128 MB	128 MB	128 MB
1024 MB	256 MB	256 MB	CRIMM	Empty
1536 MB	256 MB	256 MB	256 MB	CRIMM
2048 MB	256 MB	256 MB	256 MB	256 MB

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