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IBM Power 770 and 780 (9117-MMD, 9179-MHD) Technical Overview and Introduction
Table 2-6 shows the optimal placement of each DIMM-quad within a four-enclosure system.
Each enclosure must have at least two DIMM-quads installed.
Table 2-6 Optimum DIMM-quad placement for a four-enclosure system
2.3.3 Memory activation
The minimum amount of memory activation for the Power 770 and Power 780 servers is 50%
of the installed memory. For example, the minimum amount of memory that can be installed is
8 x 8 GB, of which 32 GB will be active. On an exception basis, a request for price quotation
(RPQ) may be requested so that memory activation may go down to 25% of the installed
memory.
Enclosure 1
CPU 1
CPU 3
CPU 4
CPU 2
Memory controller
Memory controller
Memory controller
Memory controller
J1A
J2A
J3A
J4A
J5A
J6A
J7A
J8A
J1B
J2B
J3B
J4B
J5B
J6B
J7B
J8B
Q1
Q1
Q2
Q2
Q1
Q1
Q2
Q2
Q9
Q9
Q16
Q16
Q9
Q9
Q16
Q16
Enclosure 2
CPU 1
CPU 3
CPU 4
CPU 2
Memory controller
Memory controller
Memory controller
Memory controller
J1A
J2A
J3A
J4A
J5A
J6A
J7A
J8A
J1B
J2B
J3B
J4B
J5B
J6B
J7B
J8B
Q3
Q3
Q4
Q4
Q3
Q3
Q4
Q4
Q10
Q10
Q15
Q15
Q10
Q10
Q15
Q15
Enclosure 3
CPU 1
CPU 3
CPU 4
CPU 2
Memory controller 1
Memory controller 0
Memory controller 1
Memory controller 0
J1A
J2A
J3A
J4A
J5A
J6A
J7A
J8A
J1B
J2B
J3B
J4B
J5B
J6B
J7B
J8B
Q5
Q5
Q6
Q6
Q5
Q5
Q6
Q6
Q11
11
Q14
Q14
11
Q11
Q14
Q14
Enclosure 4
CPU 1
CPU 3
CPU 4
CPU 2
Memory controller
Memory controller
Memory controller
Memory controller
J1A
J2A
J3A
J4A
J5A
J6A
J7A
J8A
J1B
J2B
J3B
J4B
J5B
J6B
J7B
J8B
Q7
Q7
Q8
Q8
Q7
Q7
Q8
Q8
Q12
Q12
Q13
Q13
Q12
Q12
Q13
Q13
Quads Q1 and Q2 must be identical to each other. Quads Q3 and Q4 must be identical to each other.
Quads Q5 and Q6 must be identical to each other. Quads Q7 and Q8 must be identical to each other.
Note: For maximum memory performance, the total memory capacity on each memory controller
must be equivalent.
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