Specifications

Chapter 2. Architecture and technical overview 49
Power 770 systems
IBM Power 770 systems support two POWER7 processor options of varying clock speed and
core counts. Table 2-3 summarizes these options.
Table 2-3 Summary of POWER7 processor options for the Power 770 server
With two POWER7 processors in each enclosure, systems can be equipped as follows:
򐂰 Using 6-core POWER7 processors:
–12 cores
–24 cores
–36 cores
–48 cores
򐂰 Using 8-core POWER7 processors:
– 16-cores
– 32-cores
– 48-cores
– 64-cores
Power 780 systems
The IBM Power 780 2-socket CEC enclosures offer POWER7 processors with 8 cores.
However, the system can be booted on one of two modes:
򐂰 MaxCore mode
򐂰 TurboCore mode
In MaxCore mode, all eight cores of each POWER7 processor are active, run at 3.92 GHz,
and have full access to the 32 MB of L3 cache. In TurboCore mode the system uses just four
of the POWER7 processor cores, but runs at the higher frequency of 4.14 GHz and has
access to the full 32 MB of L3 cache.
Table 2-4 summarizes the POWER7 processor and mode options for the Power 780 system.
Table 2-4 Summary of POWER7 processor options and modes for the Power 780 server
Cores per POWER7
processor
Frequency L3 cache size available per
POWER7 processor
63.72GHz24MB
83.30GHz32MB
Active cores per
POWER7 processor
System mode Frequency L3 cache size available per
POWER7 processor
8 MaxCore 3.92 GHz 32 MB
4 TurboCore 4.14 GHz 32 MB