# We need the heat source size of a 2-resistor model for thermal simulation

The θjb value is provided for simulation of the Jetson AGX Xavier module as a 2-resistor model in commercial CFD packages. While the heat source size of a 2-resistor model is unknown, and the heat sink‘s thermal performance (𝜃𝑝a ) depends on it.

Hi

In the thermal design guide.
We provided θjp=0.35c/w for balanced workload(most use cases) and θjp=0.6c/w for unbalanced workload, θjb=5.5c/w.
Please refer to thermal design guide for thermal evaluation.

We‘ve seen the thermal design guide. But as we know, the thermal resistance of thermal solution is related to the heat source size of a 2-resistor model.
Is it 100 X 87mm or 75 X 73mm？(heat source size of a 2-resistor model)

The TTP size is 100mm87mm, The HS_TIM size between heat-sink(thermal solution) and TTP is 75mm73mm

1, As shown in the figure, can sofeware sets two modes either 30W or maxN ?
Under different modes, whether the temperature threshold of frequency drop is shown in the table?
2, If working under maxN mode, the actual power consumption is only 30W, can temperature threshold of frequency drop be modified by software?

1, As shown in the figure, can sofeware sets two modes either 30W or maxN ?
Under different modes, whether the temperature threshold of frequency drop is shown in the table?
1、 如下图30W和maxN 两种模式是软件所设置？分别在不同mode下的降频温度阈值是下表各值？
2, If working under maxN mode, the actual power consumption is only 30W, can temperature threshold of frequency drop be modified by software?
2、 如果工作在maxN mode下，实际功耗仅30W，降频的温度阈值是否可修改？

1, As shown in the figure, can sofeware sets two modes either 30W or maxN ?
Under different modes, whether the temperature threshold of frequency drop is shown in the table?
1、 如下图30W和maxN 两种模式是软件所设置？分别在不同mode下的降频温度阈值是下表各值？
2, If working under maxN mode, the actual power consumption is only 30W, can temperature threshold of frequency drop be modified by software?
2、 如果工作在maxN mode下，实际功耗仅30W，降频的温度阈值是否可修改？
These question any update ?

1. Yes, Software can set to 30w or maxN mode, and threshold will change accordingly
2. The threshold can be changed in software, but it is not recommended.

How to change threshold value by software?

1.What is the threshole value between 30W and MaxN?
2. Can you tell me how to change temperature threshold value by software?
Thanks a lot!