54 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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