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30 Intel
®
855GME and Intel
®
852GME Thermal Design Guide for Embedded Applications
Thermal Management Features and Tools
1. The system is operating at an idle workload until an application that requires a large amount of
bandwidth is initiated. The application demands a peak bandwidth of 1200 MB/sec. for an
entire sampling window interval, and it will be reduced to the bandwidth throttle setting limit
of 1100 MB/sec. The throttle setting of 1100 MB/sec. effectively places a cap on the allowable
bandwidth.
Note: Applications are still allowed to exceed the 1100 MB/sec. limit in short bursts that last less than the
sampling window period.
2. The chipset MCH will continue to operate at the throttled amount of 1100 MB/sec. until the
application no longer requires this level of sustained bandwidth. In this case the junction
temperature has not increased to a temperature that is close to the maximum junction
temperature limit of 110º C. So it appears that for the brief period that the large bandwidth
level was required the chipset MCH was unnecessarily throttled. A drawback of using
bandwidth triggered throttling is that under certain conditions when the system is not operating
under worse case conditions the chipset MCH will be throttled regardless of the junction
temperature.
3. Once the application stops the system workload will return to a lower workload.
Figure 19. 855GME/852GME chipset MCH Bandwidth Throttling