Pentium ® Pro Processor Electrical Criteria; 17.6.3. Thermal Criteria; Table 17-10. Electrical Test Criteria For All Systems; Overdrive ® Processor Cooling Requirements - Intel Pentium Pro Family Developer's Manual

OVERDRIVE® PROCESSOR SOCKET SPECIFICATION
The criteria for the OverDrive processor that apply to all motherboards and systems are present-
ed in Table 17-10.

Table 17-10. Electrical Test Criteria for all Systems

Criteria
Vcc S
Secondary CPU Vcc Voltage
Vcc 5
Vcc continuity to Socket 8
Vss continuity to Socket 8
RESERVED Pins
Input signal quality
AC timing specifications
17.6.2.2. PENTIUM
Motherboards and systems will be tested to the specifications of the Pentium Pro processor in
Chapter 11, Electrical Specifications.

17.6.3. Thermal Criteria

17.6.3.1. OVERDRIVE
TESTING ONLY)
The maximum preheat temperature, T PH , for the OverDrive processor must not be greater than
specified in Section 17.5.1., "OverDrive® Processor Cooling Requirements". T PH is the tem-
perature of the air entering the fan heatsink and is measured 0.3 inches (0.76 cm) above the cen-
ter of the fan. Thermal testing should be performed at the OEM specified maximum system
operating temperature (not less than 32°C), and under worst case thermal loading. Worst case
thermal loading requires every I/O bus expansion slot to be filled with the longest typical add-
in card that will not violate the required clearance for airflow around the OverDrive processor
(refer to Section 17.2.2.2., "Socket 8 Space Requirements"). These add-in cards represent typi-
cal power dissipation per type and form factor (Full length PCI, VL, ISA, and 1/2 length PCI
dissipate 10W; 3/4 length ISA dissipates 7.5W, 1/2 length ISA dissipates 5W, and 1/4 length ISA
dissipates 3.3W).
17-22
Refer To:
Table 17-4 Loading Conditions:
• Max Icc S at Steady-State
• Min Icc S at Steady-State
• Fast Switch between Max and Min Icc S
Refer to Table 17-4 for OverDrive
specification.
Table 17-4 Fan/Heatsink Voltage
Table 15-3 0.5Ω or less for any single pin from Socket 8 Vcc pins
to Vcc supply.
Applies to both primary and secondary pins and their
respective supplies.
Table 15-3 0.5Ω or less for any single pin From Socket 8 Vss pins
to Vss supply.
Table 15-3 Must not be connected.
Chapter 13 & Must meet specification of the Pentium
Table 11-12
Section 11.15. Must meet all A.C. specifications of the Pentium Pro
Processor.
®
PRO PROCESSOR ELECTRICAL CRITERIA
®
PROCESSOR COOLING REQUIREMENTS (SYSTEMS
Comment
® processor Icc S
® Pro processor.