System Memory - IBM pSeries 690 Service Manual

System Memory

All of the main memory for the Eserver pSeries 690 consists of pluggable memory books in reserved
slots with two memory controllers per book. The memory books are available in various sizes. Memory
modules are not removable from the memory books. A minimum of 8 GB of memory must be installed for
the system to operate.
Eight slots, located on the front of the processor subsystem, are available for system memory books.
These slots are shown in "7040 Model 681 Processor Subsystem Front View" on page 20.
Memory to Processor Relationships
The following illustration shows the relationship between the memory riser cards, L3 cache, and the MCM
modules:
OR
15
OR
OR
14
OR
13
OR
OR
12
OR
L3
L3
0
L3
L3
Bus Bar
14 13
D
B
1
MCM
Module 3
A
C
OR
15
12
6
Bus Bar
L3 L3
L3 L3
7
L3
MCM
Module 0
L3
0
1
A
B
Bus Bar
D
C
3 2
A
4
7
C A
clock
B
D
5 6
10 11
D C
Bus Bar
B
A
8
9
L3
MCM
Module 2
L3
OR
L3
OR
3
8
L3
OR
OR
2 9
MCM
Module 1
OR OR
10
5
L3
OR OR
L3
4 11
Chapter 1. Reference Information
63