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Contents
7.5.2 Temperature Triggered Throttling..........................................................................31
8 Thermal/Mechanical Applications..............................................................................................33
8.1 Thermal Interface Materials................................................................................................33
8.1.1 Estimate Thermal Resistance................................................................................33
8.2 Mechanical Loading............................................................................................................34
8.3 Thermal and Mechanical Reliability....................................................................................34
9 Summary ......................................................................................................................................35
Figures
1 855GME and 852GME chipset MCH Package Dimensions (mm) – Top View ............................8
2 855GME and 852GME Chipset MCH Package Dimensions (mm) - Side View ...........................9
3 Package Construction Overview ................................................................................................10
4 855GM MCH Thermal Model......................................................................................................10
5 855GME MCH (4.3W) Junction Temperatures vs. Airflow .........................................................12
6 852GME Airflow Modeling Results .............................................................................................13
7 1U Reference Thermal Solution Volumetric Keepout.................................................................15
8 1U Heatsink Assembly (Heatsink, Clip Frame, and Clip Lever) ................................................. 16
9 1U Heatsink Assembly Placement and Actuation ...................................................................... 16
10 1U Heatsink Clip Assembly ........................................................................................................17
11 1U Heatsink Clip Lateral Retention Tab Feature.......................................................................18
12 1U Heatsink Clip Frame and Lever ............................................................................................19
13 CompactPCI* Heatsink Thermal Performance ........................................................................... 21
14 CompactPCI* Thermal Solution Volumetric Keepout ................................................................22
15 CompactPCI* Heatsink Assembly (Heatsink, Pull-tab, and TIM) ...............................................23
16 0 Degree Angle Attach Heatsink Modifications (not to scale......................................................26
17 0 Degree Angle Attach Methodology (not to scale) ....................................................................26
18 External Temperature Sensor ....................................................................................................27
19 855GME/852GME chipset MCH Bandwidth Throttling............................................................... 30
20 855GME/852GME chipset MCH Temperature Throttling ...........................................................31
21 Board Keep-Out Region for 1U Reference Design Heatsink and Mounting Anchor Placement 39
22 CompactPCI* Heatsink Assembly ..............................................................................................40
Tables
1 Related reference documents ......................................................................................................7
2 855GME and 852GME MCH Thermal Design Power ................................................................11
3 855GME and 852GME Chipset MCHs Maximum Temperature Value.......................................11
4 855GME and 852GME chipset MCH Maximum Case Temperature Value................................26
5 Reliability Validation ...................................................................................................................34
6 1U Reference Design Heatsink Assembly Suppliers (as referenced in Section 4) ....................36
7 CompactPCI* Reference Design Heatsink Assembly Suppliers (as referenced in Section 5)...36
8 Mechanical Drawing List.............................................................................................................38