Gateway ALR 9250R, User Manual

Page: 68 / 226

54 Gateway ALR 9250R User’s Guide
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. (See the illustration Memory Banks
below.) 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.
Memory Banks
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.
J16
J15
J12
J11
J8
J7
J3
J4
J14
J13
J10
J9
J6
J5
J1
J2
D
C
B
A
9250R_30
9250R.book Page 54 Friday, April 9, 1999 9:44 AM