Chapter 2 System Overview
Compaq Deskpro 4000 and 6000 Personal Computers
featuring the Pentium II Processor
First Edition - October 1997
2-10
2.4.1 PENTIUM II PROCESSOR
The Pentium II processor consists of microprocessor and secondary cache components contained
in a single edge connector (SEC) cartridge (Figure 2-8).
Figure 2–8.
Pentium II SEC Cartridge and Heat Sink
The microprocessor of the Pentium II is backward-compatible with software written for the
Pentium MMX, Pentium Pro, Pentium, and x86 microprocessors. The Pentium II microprocessor
includes performance enhancements for multi-byte processing. The secondary cache, being in
close proximity to the microprocessor, operates more efficiently than secondary caches located on
the system board. A heat sink is attached to the Pentium II SEC cartridge. Passive cooling is used
on most models. All minitower models utilize an auxiliary fan for processor cooling.
2.4.2 MEMORY
The system board provides three 168-pin DIMM sockets. Depending on model either 16 or 32
megabytes of SDRAM are installed. System memory can be expanded up to 384 megabytes using
8-, 16-, 32-, 64-, and 128-MB DIMMs. Parity is not used although ECC (including ECC error
logging and alerting) and EDO memory are supported.
The system ROM utilizes a flash ROM component that contains the BIOS and stores PCI, ESCD,
and EV data. The BIOS is updateable by remote or local flashing of the ROM, which includes
boot block ROM support.
Single Edge Connector
Microprocessor
Secondary Cache
Thermal Plate
Heat Sink
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