Specifications

82 IBM Flex System p260 and p460 Planning and Implementation Guide
Figure 4-13 shows the evolution of simultaneous multithreading.
Figure 4-13 Evolution of simultaneous multithreading
The various SMT modes offered by the POWER7 processor provide flexibility,
where you can select the threading technology that meets a combination of
objectives, such as performance, throughput, energy use, and
workload enablement.
Multi-threading Evolution
Thread 1 Executing
Thread 0 Executing
No Thread Executing
FX0
FX1
FP0
FP1
LS0
LS1
BRX
CRL
1995 Single thread out of order
FX0
FX1
FP0
FP1
LS0
LS1
BRX
CRL
1997 Hardware mutithread
FX0
FX1
FP0
FP1
LS0
LS1
BRX
CRL
2003 2 Way SMT
FX0
FX1
FP0
FP1
LS0
LS1
BRX
CRL
2009 4 Way SMT
Thread 3 Executing
Thread 2 Executing