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OVERDRIVE® PROCESSOR SOCKET SPECIFICATION
•
If an OEM fan/heatsink is used, then electrical connections between the OEM fan/heatsink
and system must be through an end user separable connector.
•
If an OEM fan/heatsink is used, removal of the assembly must not interfere with the
operation of the OverDrive processor, for example, by activating cooling failure protection
mechanisms employed by the OEM.
•
Custom attachment features in addition to the features covered in Section 17.2.2.3.,
"Socket 8 Clip Attachment Tabs" must not interfere with attachment of the upgrade
retention clips.
17.5.3. OverDrive
The OverDrive Voltage Regulator Module will be shipped with a passive heat sink. Voltage
regulator case temperature must not exceed 105°C. The ambient temperature, T A , required
to properly cool the VRM can be estimated from the following section.
Table 17-6. OverDrive
Typ 1
Parameter
VRM Power
6
Dissipation
6.7
7.5
T C , Max
NOTES:
1. Specification for the OverDrive
specific to the design and may differ.
2. This spec applies to the OverDrive VRM for 150 MHz Pentium Pro processor-based systems.
3. This spec applies to the OverDrive VRM for 166 & 180 MHz Pentium Pro processor-based systems.
4. This spec applies to the OverDrive VRM for 200 MHz Pentium Pro processor-based systems.
17.5.4. Thermal Equations and Data
The OverDrive Voltage Regulator Module requires that T C does not exceed 105°C. T C is mea-
sured on the surface of the hottest component of the VRM. To calculate T A values for the VRMs
at different flow rates, the following equations and data may be used:
Where, T A and T C = Ambient and Case temperature, respectively. (°C)
Q CA = Case-to-Ambient Thermal Resistance (°C/Watt)
P = Maximum Power Consumption (Watt)
17-18
®
VRM Cooling Requirements
®
VRM Power Dissipation for Thermal Design
Max 1
Unit
2 OverDrive
7
Watts
3
6.5
4
7.0
105
°C
Voltage Regulator Maximum Case Temperature
®
Voltage Regulator Module. A Pentium
×
Θ CA )
T A = T C - (P
Notes
®
VRM
®
Pro processor OEM Module is
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