Figure 6-3 Dimm Layout - Sun Microsystems Sun Fire T2000 Service Manual

At minimum, rank 0 must be fully populated with eight DIMMS of the same
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capacity.
DIMMs can be added eight at a time, of the same capacity, to fill rank 1.
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Front of
board
DIMM Layout
FIGURE 6-3
Chapter 6 Adding New Components and Devices 6-5