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Chapter 3. Technical description of the hardware architecture 51
3.7.1 Memory description of IBM BladeCenter JS23 and JS43
Express
IBM BladeCenter JS23 Express has two memory channels per POWER6
processor module (4 channel total), and each memory channel connects to a
memory buffer chip. This same configuration is present on the MPE planar of a
IBM BladeCenter JS43 Express, for a total of 8 channels.
Each memory buffer chip connects to two Registered DDIMs, giving a total of 8
DIMMs in the IBM BladeCenter JS23 Express, and 16 DIMMs in the BladeCenter
JS43 Express.
Figure 3-2 show the memory wiring layout for the base planar on an IBM
BladeCenter JS23 Express. This same wiring layout is used in the MPE planar of
an IBM BladeCenter JS43 Express.
Figure 3-2 IBM BladeCenter JS23 Express memory wiring layout (Base planar - P1)
3.7.2 Memory placement rules for IBM BladeCenter JS23 and JS43
The following are the memory placement rules for IBM BladeCenter JS23 and
JS43:
1. Install DIMM fillers in unused DIMM slots for proper cooling.
CPU 0
1
0
CPU 0
1
0
CPU 1
1
0
CPU 1
1
0
Memory
Buffer 1
Memory
Buffer 1
Memory
Buffer 2
Memory
Buffer 2
Memory
Buffer 3
Memory
Buffer 3
Memory
Buffer 4
Memory
Buffer 4
P1-C1 BusA RDDIMP1-C1 BusA RDDIM
P1-C2 BusB RDDIMP1-C2 BusB RDDIM
P1-C3 BusA RDDIMP1-C3 BusA RDDIM
P1-C4 BusB RDDIMP1-C4 BusB RDDIM
P1-C5 BusB RDDIMP1-C5 BusB RDDIM
P1-C6 BusA RDDIMP1-C6 BusA RDDIM
P1-C7 BusB RDDIMP1-C7 BusB RDDIM
P1-C8 BusA RDDIMP1-C8 BusA RDDIM
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