HP Integrity rx4640 Operation And Maintenance Manual page 155

Removing and Replacing Components
System Memory DIMMs
Supported DIMM Sizes
Supported DIMM sizes are 256MB, 512MB, 1GB, 2GB. Dissimilar DIMM sizes may be used across the entire extender board
but all four DIMMs in each quad must match. For cooling purposes, DIMM fillers must be used in some unused slots.
DIMM Slot Fillers
Both the sixteen and thirty-two DIMM extender boards have DIMM slot filler boards placed over all unfilled DIMM slots. As
you fill DIMM quads with additional memory you must remove the DIMM slot fillers covering the affected slots. All
remaining DIMM fillers in unused slots must remain in place to maximize internal cooling. See Table 7-1, "DIMM Filler
Requirements for 16 DIMM Extender Board."
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Chapter 7