5137ch02.fm
Draft Document for Review October 14, 2014 10:19 am
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IBM Power Systems E870 and E880 Technical Overview and Introduction
Table 2-14 Power E880 system node bandwidth estimates
PCIe Interconnect: Each POWER8 processor has 32 PCIe lanes running at 7.877 Gbps
full-duplex. The bandwidth formula is calculated as follows:
32 lanes * 4 processors * 7.877Gbps * 2 = 252.064 GBps
For the entire Power E880 system populated with four system nodes, the overall bandwidths
are shown in Table 2-15.
Table 2-15 Power E880 total bandwidth estimates
2.3.5 Active Memory Mirroring
The Power E870 and Power E880 systems have the ability to provide mirroring of the
hypervisor code across multiple memory CDIMMs. If a CDIMM that contains the hypervisor
code develops an uncorrectable error, its mirrored partner will enable the system to continue
to operate uninterrupted.
System node bandwidths
Power E880
32 cores @ 4.350 GHz
L1 (data) cache
6,682 GBps
L2 cache
6,682 GBps
L3 cache
8,909 GBps
Total Memory
922 GBps
PCIe Interconnect
252.064 GBps
Intra-node buses
(two system nodes)
922 GBps
Rounding: The bandwidths listed here may appear slightly differently in other materials
due to rounding of some figures.
Total bandwidths
Power E880
128 cores @ 4.350 GHz
L1 (data) cache
26,726 GBps
L2 cache
26,726 GBps
L3 cache
35,635 GBps
Total Memory
3,688 GBps
PCIe Interconnect
1008.256 GBps
Inter-node buses (four
system nodes)
307 GBps
Intra-node buses (four
system nodes)
3,688 GBps
Note: At the time of writing, the Power E880 supports only two system nodes per server.
