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68 IBM ^ xSeries 440 Planning and Installation Guide
When installing DIMMs, try to evenly divide the amount of RAM available
between the two ports.
For example, if you have 12 DIMMs (eight 512 MB DIMMs and four 1 GB
DIMMs for a total of 8 GB), install all eight 512 MB DIMMs (4 GB) in one port
and the four 1 GB DIMMs (also 4 GB) in the other port. This will give you
better performance than mixing four 512 MB DIMMs and four 1 GB DIMMs (6
GB total) in one port and four 512 MB DIMMs (2 GB) in the other port.
Additional memory considerations
An x440 system with two SMP Expansion Modules installed currently supports a
maximum of 64 GB of memory, using 2 GB DIMMs. To enable your operating
system to address this amount of memory, there may be certain operating
system configuration modifications required.
For example, to enable Windows 2000 Advanced Server and Datacenter Server
to access physical memory over 4 GB, the /PAE switch is required in the boot.ini
file. For detailed information on the /PAE switch and the /3GB switch, refer to
Microsoft Knowledge Base Article Q283037 at:
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q283037
3.1.3 PCI slot configuration
As shown in Figure 3-2 on page 69, there are six PCI-X slots internal to the x440.
These six slots are implemented using four PCI buses, labeled A-D in Figure 3-2
on page 69:
Bus A (slot 1 and slot 2): Two 64-bit 66 MHz slots
Bus B (slot 3 and slot 4): Two 64-bit 100 MHz slots (133 MHz if only one slot is
occupied)
Bus C (slot 5): One 64-bit 133 MHz slot
Bus D (slot 6): One 64-bit 133 MHz slot