HP Integrity rx7640 and HP 9000 rp7440 Servers Installation Guide

Figure 7 CPU Locations on Cell Board
Memory Subsystem
Figure 8 shows a simplified view of the memory subsystem. It consists of two independent access
paths, each path having its own address bus, control bus, data bus, and DIMMs . Address and
control signals are fanned out through register ports to the synchronous dynamic random access
memory (SDRAM) on the DIMMs.
The memory subsystem comprises four independent quadrants. Each quadrant has its own memory
data bus connected from the cell controller to the two buffers for the memory quadrant. Each
quadrant also has two memory control buses; one for each buffer.
14 HP Integrity rx7640 Server and HP 9000 rp7440 Server Overview