Memory Subsystem - IBM Power Systems 775 Manual

1.4.8 Memory subsystem

The memory controller layout is shown in Figure 1-11.
DIMM
.
DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM
DIMM
.
DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM DRAM
Figure 1-11 Memory controller layout
The memory cache sizes are shown in Table 1-3.
Table 1-3 Cache memory sizes
Cache level
L1
L2
L3
The memory subsystem features the following characteristics:
Memory capacity: Up to 128 GB/processor
Memory bandwidth: 128 GB/s (peak)/processor
Eight channels of SuperNOVA buffered DIMMs/processor
Two memory controllers per processor:
– Four memory busses per memory controller
– Each buss is 1 B-wide Write, 2 B-wide Read
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IBM Power Systems 775 for AIX and Linux HPC Solution
DRAM
8B
DRAM
2B Read
SN
1B Write
DRAM
8B
DRAM
FSI
FSI
DRAM
DRAM 8B
SN
2B Read
1B Write
DRAM
8B
DRAM
p7
DRAM
2B Read
DRAM 8B
1B Write
SN
DRAM
DRAM 8B
FSI
FSI
DRAM
8B
DRAM
2B Read
SN
1B Write
DRAM
8B
DRAM
Memory size (per core)
32 KB Instruction, 32 KB Data
256 KB
4 MB eDRAM
DIMM
DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM
2B Read
8B
SN
1B Write
DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM
8B
FSI
FSI
DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM
8B
SN
2B Read
8B
1B Write
DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM
8B
DIMM
DRAM DRAM DRAM DRAM DRAM
2B Read
DRAM DRAM DRAM DRAM
8B
1B Write
SN
DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM
8B
FSI
FSI
DRAM DRAM DRAM DRAM DRAM
8B
DRAM DRAM DRAM DRAM
2B Read
SN
1B Write
DRAM DRAM DRAM DRAM DRAM
8B
DRAM DRAM DRAM DRAM
.
DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM
.
DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM
DRAM DRAM DRAM DRAM DRAM DRAM