Is it safe to increase the frequencies of 6 CPU cores to 1.9GHz for commercial products?

[hecnl4o]

Hello,

From NX datasheet and the power modes in the link below, the CPU frequency is only 1.4GHz when all 6 CPU cores are online.
https://docs.nvidia.com/jetson/archives/l4t-archived/l4t-3242/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide%2Fpower_management_jetson_xavier.html%23wwpID0E0LO0HA

In our testing, we found 6 CPU cores can all be running at 1.9GHz by conducting the following Linux command:
for i in /sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq; do echo 1907200 > $i; done

And the performance benchmark SW shows significantly better CPU performance after increasing the CPU clocks from 1.4GHz to 1.9GHz.

In the post below, it says “we cannot guarantee the behavior and quality of NX then”.

Jetson NX Power Modes - no MAXN for max. Performance?

Thank you for your fast response. One question still remains, if i understand the l4t guide correctly (link posted above) i can define custom power modes for both AGX and NX, with the limitation of “The frequencies you select are subject to the MaxN limit defined in mode 0”. In NX there is no MAXN Mode and the 15W is due to hardware design limitation. What happens if i then define a custom mode that e.g. activates all 6 cpu cores with a higher frequency than 1400Hz (NX, mode 2), therefore poss…

Based on the results of nVIDIA’s internal evaluation, is it safe for customers to keep the frequency of all 6 CPU cores running at 1.9GHz for commercial product launch? Is the 1-year warranty still valid for NX SOM if 1.9GHz is used for all 6 CPU cores in commercial SW?

Thanks!

[kayccc]

Hi hecnl4o,

You can set all CPU cores at 1.9HGz for your use case, provided you make the appropriate tradeoffs with other clocks and system level thermal design. The Jetson Power Estimator tool can help get you started adjusting clocks and getting power estimates before application development, and then you’ll refine as you go along. The Jetson Xavier NX Thermal Design Guide provides necessary overall guidance.

Here is the powerEstimator user Guide as your reference.

[hecnl4o]

Hi, kayccc,

Thank you for providing the link of Power Estimator tool and suggestions here! This tool is very helpful. We will adjust other clocks when CPU freq is 1.9GHz.

[efiryw2d]

Hi,
Is there a power estimator tool for the Jetson Xavier AGX?

[kayccc]

The above Jetson Power Estimator tool can be used on AGX Xavier as well.

[efiryw2d]

No. It only shows. The Xavier NX as an option.
Any way to change it to the Xavier AGX?

THANKS!

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[kayccc]

Please check https://jetson-tools.nvidia.com/

[hecnl4o]

@kayccc
I tried the Jetson Power Estimator tool last year to check allowed CPU and GPU frequencies. When 6 CPUs are running at 1.9GHz, GPU’s freq allowed by that tool is only around 300GHz. However, GPU can still reach its peak freq when I run the CPU benchmarking SW with 6 CPUs at 1.9GHz in parallel to 1080p video playing on a real NX device.
We are going to launch commercial products this year. The overclocking on NX seems compelling, due to 35% performance increase. Is nVIDIA ok for customers to overclock NX CPU for commercial products?

[efiryw2d]

I have checked, only Xavier NX.

[kayccc]

Hi efiryw2d,

There is no power estimator tool for Jetson AGX Xavier, we support only Jetson Xavier NX.

[kayccc]

Hi hecnl4o,

The GPU & CPU power not only depends on frequency. It also depends on utilization & temperature. You can increase clock frequency & number of active cores in any power mode but when total module average power consumption exceeds 15W, the CPU/GPU clocks will be automatically throttled (50%) by HW to reduce power consumption, thus your product may observe sudden performance drop in such cases.