276 COG12. Memory can be installed using one of two methodologies: Performance installation or cost-effectiveinstallation. Performance installation populates one pair of DIMMs per memory card, until four cards areinstalled, before adding a second pair of DIMMs to a card. Cost-effective installation fully populates eachmemory card before adding additional cards.13. Single core Datacenter solutions containing more than 16 processors require one ScalabilityEnablement/Memory Adapter (P/N 41Y5004) per chassis. x3950 E dual core Datacenter solutionscontaining 16 processors and greater require one Scalability Enablement/Memory Adapter (P/N41Y5004) per chassis. Proof of the appropriate U.S. Government Export License must exist before thisoption can be ordered or shipped to Tier 3 countries. In addition to providing scalability support, thisadapter supports four memory DIMMs and can be used in place of one of the standard, four-slotmemory adapters.14. This option kit includes the components necessary to upgrade systems that currently have single-coreIntel Xeon MP processors installed to support the dual-core Intel Xeon MP processors. Processors are notincluded in the kit and must be purchased separately. Once the system is upgraded, the new systemmodel type must be registered with IBM. Directions for registering the new system model type areincluded in the option.15. A maximum of two ServeRAID 8i controllers is allowed per Datacenter node (each instance of theoperating system). One of the two ServeRAID 8i controllers must be installed in the x3950. The otherServeRAID 8i controller can be installed in an x3950 E to fit your configuration.16. Minimum two identical HDDs required per node on primary server (x3950) for OS. HDDs are optionalfor x3950 E. Max = 6 HDDs per chassis.17. Minimum two required per node on primary server (x3950) for load balancing and redundancy. Optionalfor x3950 E.18. One required per chassis for service processor interconnection. The service processors of all chassis mustbe connected together via an ethernet network.Datacenter high availability solution additional optionsTable 49. Datacenter High Availability Solution Additional Options 1Additional, certified options for use with IBM Datacenter solutions.OptionNumber Description CommentDisk Systems Can be attached to both x3950 and x3950 E.181582H TotalStorage DS4800 Midrange Disk System181584H TotalStorage DS4800 Midrange Disk System181588H TotalStorage DS4800 Midrange Disk SystemI/O Controllers31P9601 PRO/1000 MT Server Ethernet Adapter by Intel Can be installed in models 88722xx, 88723xx,88725xx, 88726xx, 88741xx and 88742xx73P2701 PRO/1000 MT Dual Port Server Ethernet Adapterby IntelCan be installed in models 88722xx, 88723xx,88725xx, 88726xx, 88741xx and 88742xx73P4001 NetXtreme 1000SX+ Fiber Ethernet Adapter Can be installed in models 88722xx, 88723xx,88725xx, 88726xx, 88741xx and 88742xx73P4101 NetXtreme 1000 T + Ethernet Adapter Can be installed in models 88722xx, 88723xx,88725xx, 88726xx, 88741xx and 88742xx73P4201 NetXtreme 1000 T + Dual Port Ethernet Adapter Can be installed in models 88722xx, 88723xx,88725xx, 88726xx, 88741xx and 88742xx39Y6088 NetXtreme 1000 SxG Ethernet Adapter Can be installed in models 88727AY, 88727BY,88728AY, 88728BY, 88743AY and 88743BY