Specifications

58 IBM Power 770 and 780 Technical Overview and Introduction
2.3.3 Memory throughput
POWER7 has exceptional cache, memory, and interconnect bandwidths. Table 2-11 shows
the bandwidth estimate for the Power 770 system running at 3.3 GHz.
Table 2-11 Power 770 memory bandwidth estimates for POWER7 cores running at 3.3 GHz
With an increase in frequency, the Power 780 running at 3.92 GHz generates higher cache
bandwidth (Table 2-12).
Table 2-12 Power 780 memory bandwidth estimates for POWER7 cores running at 3.92 GHz
In TurboCore mode, the Power 780 will have its cores running at 4.14 GHz generating even
higher cache bandwidth (Table 2-13).
Table 2-13 Power 780 memory bandwidth estimates for POWER7 cores running at 4.14 GHz
Memory Bandwidth
L1 (data) cache 158.4 Gbps
L2 cache 158.4 Gbps
L3 cache 105.6 Gbps
System memory:
4x enclosures:
136.44 Gbps per socket
1091.58 Gbps
Inter-node buses (four enclosures) 158.02 Gbps
Intra-node buses (four enclosures) 415.74 Gbps
Memory Bandwidth
L1 (data) cache 188.16 Gbps
L2 cache 188.16 Gbps
L3 cache 125.44 Gbps
System memory:
4x enclosures:
136.45 Gbps per socket
1091.58 Gbps
Inter-node buses (4 enclosures) 158.02 Gbps
Intra-node buses (4 enclosures) 415.74 Gbps
Memory Bandwidth
L1 (data) cache 198.72 Gbps
L2 cache 198.72 Gbps
L3 cache 132.48 Gbps
System memory:
4x enclosures:
136.45 Gbps per socket
1091.58 Gbps
Inter-node buses (4 enclosures) 158.02 Gbps
Intra-node buses (4 enclosures) 415.74 Gbps