Specifications

E PENTIUM® PRO PROCESSOR AT 150, 166, 180, and 200 MHz
77
Table 29. Pin Listing in Alphabetic Order (Continued)
Signal Name Pin # Signal Name Pin # Signal Name Pin #
V
SS
BA47 V
SS
BC9 V
SS
BC39
V
SS
BC1 V
SS
BC17 V
SS
BC41
V
SS
BC3 V
SS
BC21 V
SS
BC43
V
SS
BC5 V
SS
BC25 V
SS
BC45
V
SS
BC7 V
SS
BC29 V
SS
BC47
8.0. OVERDRIVE
®
PROCESSOR
SOCKET SPECIFICATION
8.1. Introduction
Intel will offer future OverDrive processors for the
Pentium Pro processor. This OverDrive processor
will be based on a faster, future Intel processor core.
The future OverDrive processor for Pentium Pro
processor-based systems is a processor upgrade
that will make all software run faster on an existing
Pentium Pro processor system. The OverDrive
processor is binary compatible with the Pentium Pro
processor. The OverDrive processor is intended for
use as a replacement upgrade for single and dual
processor Pentium Pro processor designs. The
OverDrive processor will be equipped with an integral
fan/heatsink and retention clips. Intel plans to ship
OverDrive processors with a matched Voltage
Regulator Module (OverDrive VRM).
To support processor upgrades, a Zero Insertion
Force (ZIF) socket (Socket 8) and a Voltage
Regulator Module connector (Header 8) have been
defined along with the Pentium Pro processor.
Header 8 can be populated with an OEM Pentium
Pro processor VRM or with the OverDrive VRM
which Intel plans to ship with the OverDrive
processor as part of the retail package.
The OverDrive processor will also support Voltage
Identification as described in Section 3.6. The four
Voltage ID outputs (VID0-VID3) can be used to
design a programmable power supply that will meet
the power requirements of both the Pentium Pro and
OverDrive processors via the Header 8 described in
this section, or on the motherboard. If you plan to use
VID to design a programmable supply for the
OverDrive processor, please contact Intel for
additional information.
A single socket system should include Socket 8 and
Header 8. When this system configuration is
upgraded, the Pentium Pro processor and its VRM
are replaced with a future OverDrive processor for
Pentium Pro processor-based systems and its
matching OverDrive VRM. The OverDrive VRM is
capable of delivering the lower voltage and higher
current required by the upgrade. Other voltage
regulation configurations are described in
Section 8.3.2.
8.1.1. TERMINOLOGY
Header 8 : 40-pin Voltage Regulator Module (VRM)
connector defined to contain the OEM VRM and
OverDrive VRM.
OverDrive
®
Processor: A future OverDrive
processor for Pentium Pro processor-based
systems.
OverDrive
®
VRM: A VRM designed to provide the
specific voltage required by the future OverDrive
processor for Pentium Pro processor-based
systems.
Socket 8: 387-pin SPGA Zero Insertion Force (ZIF)
socket defined to contain either a Pentium Pro or
OverDrive processor.
8.2. Mechanical Specifications
This section specifies the mechanical features of
Socket 8 and Header 8. This section includes the
pinout, surrounding space requirements, and
standardized clip attachment features.
Figure 45 shows a mechanical representation of the
OverDrive processor in Socket 8 and the OverDrive
VRM in Header 8.