
Chapter 2. New hardware 17
Figure 2-2 Design of the CPU board of the p630 with a POWER4 SCM
2.1.3 System board design
As mentioned in 2.1.1, “Introduction to the p630 server” on page 15, one or two
CPU boards can be installed in the machine. The two system boards are
connected through a fabric bus providing two 64-bit pathways at 500 MHz,
allowing a peak of 8 GB/s shared between the two cards. Both cards can use the
memory on either card. The connection to the system board is accomplished
using the p690 GX 32-bit wide bus operating at 333.3 MHz. There are two buses,
thus allowing a theoretical peak of 2.66 GB/s. The system is connected to the ...