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.

E

J16

D

J14

J15

J13

J12

C

J10

J11

J9

J8

B

J6

J7

J5

J4

A

J2

J3

J1

 

Figure 4: Memory Banks

Memory 23