Intergraph RAX Systems System Reference Manual page 39

Before you install memory, do the following:
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Inspect DIMM keying. The slot keys on the DIMM must match the slot keys in the
DIMM socket. This ensures that you have the correct voltage and type of DIMM.
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Inspect DIMM contacts. The DIMM must have gold-plated fingers that match the gold-
plated socket contacts.
Follow these population rules to correctly install DIMMs:
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Install DIMMs one bank at a time; begin with bank 0 (nearest to the processor) or the first
open bank; end with bank 3.
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Do not mix registered and unbuffered DIMMs.
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Do not mix ECC and non-ECC DIMMs.
NOTE Whenever you change your memory type, either from ECC to non-ECC or the reverse, you
should verify that the DRAM Type BIOS parameter is set correctly. For more information, see
System Setup .
The following tables show possible memory configurations. Each bank contains one socket.
Memory size
128 MB
256 MB
Memory
128 MB
256 MB
384 MB
512 MB
1 GB
See Chapter 2, "Servicing the System," for instructions to install a DIMM. See the System
Board Manual for DIMM socket locations.
Configuration (ECC)
16 x 72
32 x 72
Bank 0 Bank 1
128 MB
128 MB 128 MB
128 MB 128 MB
128 MB 128 MB
256 MB 256 MB
256 MB 256 MB
Configuration (non-ECC)
16 x 64
N/A
Bank 2 Bank 3
128 MB
128 MB 128 MB
256 MB 256 MB
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