
34 IBM ^ Cluster 1600 Managed by PSSP 3.5: What’s New
2.4.3 System board design
As described in 2.4.1, “Introduction to the p650 server” on page 32, one to four
CPU boards can be installed in the machine. The four CPU boards are
connected through a fabric interconnect providing two 64-bit pathways at 500
MHz, allowing a peak of 8 GB/s shared between the cards. All cards can use the
memory on its own card and on the other. The connection to the system board is
accomplished using the GX bus operating at 32 bit and at 333.3 MHz. The first
processor cards connect to the mandatory first I/O hub, a second I/O hub for
more attached subsystems is optional. ...