Ibm RS/6000 Manuel d'utilisateur Page 45

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2.4.1 Standard Features
In this section, we describe the standard features of the RS/6000 Model E20 and
point out their most important characteristics.
Processor Subsystem
The PCI-based RS/6000 Model E20 server features the PowerPC 604
microprocessor at 100 MHz. The processor includes an L1 cache composed by a
16 KB instruction and a 16 KB data cache.
The L2 cache is integrated onto the CPU board and is always present in the base
system. The synchronous L2 cache is 512 KB in size.
Memory
The Model E20 comes standard with a 16 MB ECC memory DIMM in one memory
slot. The system memory can be expanded up to 512 MB. For this reason, eight
memory sockets are provided which accept 8 MB, 16 MB, 32 MB or 64 MB 168-pin
DIMMs. As DIMM sockets are used, a single memory slot can be added each time
with no need to add them in pairs.
No Select Feature for Memory
The standard 16 MB memory DIMM cannot be selected for memory upgrades in
initial machine order.
Either parity or ECC memory DIMMs can be used and mixed together, providing
great flexibility. This allows the customer to easily upgrade the processor cards
without taking care which kind of memory is installed.
Bays
The system, as shown in Figure 9 on page 22, contains eight bays, three of which
accommodate the following standard devices:
3.5-inch diskette drive bay
It accommodates the standard 1.44 MB diskette drive.
5.25-inch CD-ROM drive bay
It accommodates the standard Quad-speed 680 MB CD-ROM drive with the
convenience of loading a CD without a caddy. The tray loading mechanism
provides support for 12 and 8 cm disks.
The CD-ROM supports standard and XA formats. Its multi-session capability
supports Photo-CD applications.
5.25-inch disk drive bay
It accommodates the standard 1080 MB disk drive that can be upgraded in the
initial machine order to a 1.1 GB or 2.2 GB disk.
The five empty bays can accommodate 3.5-inch or 5.25-inch drives such as disk,
CD-ROM, tape drives or other removable-media drives. Although these bays are
1.6-inch high, they can be used with 1.0-inch high devices only (see 2.4.3,
“RS/6000 Model E20 Limitations” on page 31).
Chapter 2. PCI-Based RS/6000 Server Hardware 21
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