HP rp7420, Service Manual, Page: 24 / 127

Table 1-2 Cell Board CPU Load Order (continued)
Socket 3 Location Socket 2 Location Socket 1 Location Socket 0 Location Number of
CPUs Installed
Empty or CPU CPU installed CPU or empty CPU installed Six
CPU installed CPU installed CPU installed CPU installed Eight
Figure 1-8 CPU Locations on Cell Board
DIMMs
Custom designed by HP, each DIMM contains 36 x 4 SDRAM memory components similar to
PC-133 memory, but qualified to run at 125 MHz. They have a low-voltage TTL interface. The
CEC does not support traditional DRAMs.
The HP 9000 rp7420 server supports DIMMs with 256 MB, 512, MB, 1 GB, and 2 GB capacity.
Table 1-3 shows each DIMM supported with its associated capacity, the resulting total system
capacity, and the memory component density.
DIMMs must be loaded in sets of two at specific locations. For best performance, HP recommends
loading sets of eight DIMMs.
Table 1-3 HP 9000 rp7420 server DIMMs
Memory Component Density Total Capacity DIMM Capacity
32 Mb 8 GB 256 MB
64 Mb 16 GB 512 MB
128 Mb 32 GB 1 GB
256 Mb 64 GB 2 GB
512 Mb 128 GB 4 GB
24 Overview