Vendor Contacts For Socket 8 And Header 8; 17.2.2. Socket 8 Definition; Socket 8 Pinout; Figure 17-2. Overdrive ® Processor Pinout - Intel Pentium Pro Family Developer's Manual

17.2.1. Vendor Contacts for Socket 8 and Header 8

Contact your local Intel representative for a list of participating Socket 8 and Header 8 suppliers.

17.2.2. Socket 8 Definition

Socket 8 is a 387-pin, modified staggered pin grid array (SPGA), Zero Insertion Force (ZIF)
socket. The pinout is identical to the Pentium Pro processor. Two pins are used to support the
on-package fan/heatsink included on the OverDrive processor and indicate the presence of the
OverDrive processor. The OverDrive processor package is oriented in Socket 8 by the asymmet-
ric use of interstitial pins. Standardized heat sink clip attachment tabs are also defined as part of
Socket 8 (Section 17.2.2.3., "Socket 8 Clip Attachment Tabs").
17.2.2.1.

SOCKET 8 PINOUT

Socket 8 is shown in Figure 17-2 along with the VRM connector (Header 8). Refer to Chapter
15, Mechanical Specifications, for pin listings of the Pentium Pro processor. The OverDrive
processor pinout is identical to the Pentium Pro processor. Descriptions of the upgrade spe-
cific pins are presented in Table 17-1. Note the location of pin A1 in relation to the cam shelf
position. If the socket has the cam shelf located in a different position, then correct insertion
of the OverDrive processor may not be possible. See Section 17.2.2.2., "Socket 8 Space
Requirements".
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OVERDRIVE® PROCESSOR SOCKET SPECIFICATION
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Figure 17-2. OverDrive ® Processor Pinout
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