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Memory 23
Memory
The system comes standard with 256-MB of ECC RAM. System RAM is
expandable up to 4-GB using ECC 50- or 60-ns 72-bit EDO DIMMs
(16 DIMM sockets) with gold contacts.
Main memory resides on an expansion card, called a memory module,
designed specifically for this server. The memory module contains slots for
16 DIMMs, each of which must be at least 32 MB, and is attached to the
system board through a dedicated connector. Memory amounts from
128 MB to 4 GB of RAM are supported, with a 64/72-bit
four-way-interleaved pathway to main memory.
The 16 slots are divided into four banks of four slots each, labeled A
through D. These banks support 4:1 interleaving. The memory controller
supports EDO DRAMs. The ECC used for the memory module is capable
of correcting single-bit errors (SBEs) and detecting 100 percent of double-
bit errors over one code word. Nibble error detection is also provided.
Figure 4: Memory Banks
J16
J15
J12
J11
J8
J7
J3
J4
J14
J13
J10
J9
J6
J5
J1
J2
D
C
B
A
E
3424.boo Page 23 Wednesday, September 2, 1998 9:23 AM