IBM OpenPower 720, Технический обзор и введение

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OpenPower 720 Technical Overview and Introduction
Figure 2-5 Processor card with DDR1 memory socket layout view
2.2.1 Available processor speeds
The OpenPower 720 operates with a processor clock rate of 1.65 GHz for 2 and 4-way
POWER5 processor-based systems and 1.5 GHz for 1 and 2-way systems.
All processors installed on a single system must operate at the same clock speed.
2.3 Memory subsystem
The OpenPower 720 system offers pluggable DIMMs for memory. Each processor card
contains eight slots for up to eight pluggable DIMMs. The minimum memory for an
OpenPower 720 processor-based system is 0.5 GB and 64 GB as a maximum installable
memory option. The memory capacity is dependant on the number of processors ordered for
the system and on the type of memory and functionality required. Figure 2-6 on page 25
shows the offerings and memory slot availability.
2.3.1 Memory placement rules
The memory features available at the time of writing for the OpenPower 720 are listed in
1.3.2, “Memory features” on page 6.
Memory features that contain two DIMMs, or pair, must be installed in the following order J1A
and J0A, J1C and J0C, J1B and J0B, and finally J1D and J0D. Memory must be balanced
across the DIMM slots.
Memory features that contain four DIMMs, or quad, and must be installed according to
Figure 2-6 on page 25. The first quad slots are J1A, J0A, J1C, and J0C, and for the second
quad, the slots are J1B, J0B, J1D, and J0D. The 0.5 GB memory feature must be installed in
J0A and J1A.
Note: A quad must consist of a single feature (that is made of identical DIMMs). Mixed
DIMM capacities in a quad will result in reduced RAS.