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Introduction
8 Intel
®
E8500 Chipset North Bridge (NB) and eXternal Memory
Bridge (XMB) Thermal/Mechanical Design Guide
001239
1.2 Definition of Terms
BGA Ball grid array. A package type, defined by a resin-fiber substrate, onto which a
die is mounted, bonded and encapsulated in molding compound. The primary
electrical interface is an array of solder balls attached to the substrate opposite
the die and molding compound.
BLT Bond line thickness. Final settled thickness of the thermal interface material
after installation of heatsink.
ICH5 I/O controller hub. The chipset component that contains the primary PCI
interface, LPC interface, USB, S-ATA, and other legacy functions.
IHS Integrated Heat Spreader, Integral part of the NB package. It enhances
dissipation of heat generated by the NB die and provides interface surface
between NB die and cooling solution.
IMI Independent memory Interfaces. Port connecting the NB to the XMB
T
case_max
Maximum die temperature allowed. This temperature is measured at the
geometric center of the top of the package die.
T
case_min
Minimum die temperature allowed. This temperature is measured at the
geometric center of the top of the package die.
TDP Thermal design power. Thermal solutions should be designed to dissipate this
target power level. TDP is not the maximum power that the chipset can
dissipate.
TIM Thermal interface material. Thermally conductive material installed between
two surfaces to improve heat transfer and reduce interface contact resistance.
NB Intel
®
E8500 chipset North Bridge Component. The chipset component that
provides the interconnect to the processors, XMBs and various I/O components.
Figure 1-1. Thermal Design Process
Intel
®
6700PXH
64-bit PCI Hub
The chipset component that performs PCI bridging functions between the PCI
Express* interface and the PCI Bus. It contains two PCI bus interfaces that can
be independently configured to operate in PCI (33 or 66 MHz) or PCI-X*
mode 1 (66, 100 or 133 MHz), for either 32- or 64-bit PCI devices.