# QCS6490 thermal testing and results
Source: [https://docs.qualcomm.com/doc/80-70014-251/topic/thermal_testing.html](https://docs.qualcomm.com/doc/80-70014-251/topic/thermal_testing.html)
## Test environment
Figure : Thermal test setup
Figure : Setup 1: Heatsink – only baseplate
SOM + interposer can support up to 7.45W at 95C Tj limit with above design.
Figure : Setup 2: Heatsink – baseplate with fan
SOM + interposer can support up to 11W at 95C Tj limit with above design.
## Test scenario - example 1
- Power supply: 4.2v for SOM and interposer, 12v for others
- Power Mmeasure : SOM power and interposer power
- Ta setting : 25C with a temperature chamber
- vML for GPU and HTP is running Tflite+QNN
- v5Camera is 3xIMX577 720p30fps preview + recording，2xOV9282 720p30fps RDI
dump
## Test case
Sample use cases for test case example 1.
| Area | Test cases |
| --- | --- |
| Case1 (5camera+2 AI + Iperf3+Display+BT+wlan
wlan+Audio) | IMX577 camera1\_720p@30fps\_preview+recording |
| Case1 (5camera+2 AI + Iperf3+Display+BT+wlan
wlan+Audio) | IMX577 camera2\_720p@30fps\_preview+recording |
| Case1 (5camera+2 AI + Iperf3+Display+BT+wlan
wlan+Audio) | IMX577 camera3\_720p@30fps\_preview+recording |
| Case1 (5camera+2 AI + Iperf3+Display+BT+wlan
wlan+Audio) | OV9282 Camera1\_720p@30fps\_\_RDI\_dump |
| Case1 (5camera+2 AI + Iperf3+Display+BT+wlan
wlan+Audio) | OV9282 Camera2\_720p@30fps\_\_RDI\_dump |
| Case1 (5camera+2 AI + Iperf3+Display+BT+wlan
wlan+Audio) | 2ML QNN running on HTP(Benchmark) |
| Case1 (5camera+2 AI + Iperf3+Display+BT+wlan
wlan+Audio) | GPU run with Weston sample |
| Case1 (5camera+2 AI + Iperf3+Display+BT+wlan
wlan+Audio) | Iperf3 1Gbps via ethernet |
| Case1 (5camera+2 AI + Iperf3+Display+BT+wlan
wlan+Audio) | HDMI with Weston launch |
| Case1 (5camera+2 AI + Iperf3+Display+BT+wlan
wlan+Audio) | BT paired |
| Case1 (5camera+2 AI + Iperf3+Display+BT+wlan
wlan+Audio) | WLAN connected and Ping |
| Case1 (5camera+2 AI + Iperf3+Display+BT+wlan
wlan+Audio) | Audio playback over speaker |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| Area | Test cases |
| --- | --- |
| Case2 (5camera+1 AI +GPU GPU+Display+BT+wlan
wlan+Audio) | IMX577 camera1\_720p@30fps\_preview+recording |
| Case2 (5camera+1 AI +GPU GPU+Display+BT+wlan
wlan+Audio) | IMX577 camera2\_720p@30fps\_preview+recording |
| Case2 (5camera+1 AI +GPU GPU+Display+BT+wlan
wlan+Audio) | IMX577 camera3\_720p@30fps\_preview+recording |
| Case2 (5camera+1 AI +GPU GPU+Display+BT+wlan
wlan+Audio) | OV9282 Camera1\_720p@30fps\_\_RDI\_dump |
| Case2 (5camera+1 AI +GPU GPU+Display+BT+wlan
wlan+Audio) | OV9282 Camera2\_720p@30fps\_\_RDI\_dump |
| Case2 (5camera+1 AI +GPU GPU+Display+BT+wlan
wlan+Audio) | 1ML QNN running on HTP(Benchmark) |
| Case2 (5camera+1 AI +GPU GPU+Display+BT+wlan
wlan+Audio) | GPU run with Weston sample |
| Case2 (5camera+1 AI +GPU GPU+Display+BT+wlan
wlan+Audio) | HDMI with Weston launch |
| Case2 (5camera+1 AI +GPU GPU+Display+BT+wlan
wlan+Audio) | BT paired |
| Case2 (5camera+1 AI +GPU GPU+Display+BT+wlan
wlan+Audio) | WLAN connected and Ping |
| Case2 (5camera+1 AI +GPU GPU+Display+BT+wlan
wlan+Audio) | Audio playback over speaker |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
| | |
## Thermal profile summary – test case example 1
Table : Setup-1: Only base plate heatsink thermal solution
| Case | SOM Power (W) | Interposer Power (W) | Tj\_Avg (℃) | quiet-therm-usr (℃) | Comment |
| :---: | :---: | :---: | :---: | :---: | :---: |
| CPU drystone 30%+1GPU+1HTP+5camera | 4.87 | 2.04 | 78.75 | 68.89 | No trigger LMH |
| CPU drystone 45%+1GPU+1HTP+5camera | 5.31 | 2.03 | 84.48 | 72.60 | No trigger LMH |
| CPU drystone 60%+1GPU+1HTP+5camera | 5.39 | 2.06 | 86.33 | 73.91 | No trigger LMH |
Table : Setup-2 : Base plate with fan thermal solution
| Case | SOM power (W) | Interposer power (W) | Tj\_Avg (℃) | quiet-therm-usr (℃) | Comment |
| :---: | :---: | :---: | :---: | :---: | :---: |
| CPU drystone 30%+1GPU+1HTP+5camera | 4.31 | 2.03 | 52.6 | 44.50 | No trigger LMH |
| CPU drystone 45%+1GPU+1HTP+5camera | 4.6 | 2.03 | 55.27 | 45.87 | No trigger LMH |
| CPU drystone 60%+1GPU+1HTP+5camera | 5.77 | 2.02 | 64.37 | 48.83 | No trigger LMH |
Note:
- SOM power includes: SoC, PMICs, memory (RAM+FLASH), Wifi, GNSS (if
used)
- Interposer power includes: QPS615 PCIE bridge chip, PCIE to USB bridge chip,
Ethernet PHY chips for2.5GbE/10GbE (if used)
## Thermal profile summary – test case example 2
| Case | SOM@4.2V(in W) | Interposer@4.2V(in W) | Ta | Tj start | last5min\_ Tj\_Avgr(℃) | Tj\_ Max(℃) | LMH | cdsp loading | GPU loading | CPU loading | Comment |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 5Camera (3xlMX577 720p30fps preview + recording,2xOV9282
720p30fps RDI dump) | 6.12 | 2.07 | 26.20 | 33.90 | 91.49 | 95.0 | Yes (Triggered five times during last 5 mins and
then recovered) | 97.22% | 91.08% | Total CPU Util: 64.67% CPUO\_Uti l:83.87% CPU4 \_
Util: 54.23% CPU7 Util:20.52% | 1.Test duration: ~40 min |
| 2 QNN run on HTP | 6.12 | 2.07 | 26.20 | 33.90 | 91.49 | 95.0 | Yes (Triggered five times during last 5 mins and
then recovered) | 97.22% | 91.08% | Total CPU Util: 64.67% CPUO\_Uti l:83.87% CPU4 \_
Util: 54.23% CPU7 Util:20.52% | 1.Test duration: ~40 min |
| 1 QNN run on GPU | 6.12 | 2.07 | 26.20 | 33.90 | 91.49 | 95.0 | Yes (Triggered five times during last 5 mins and
then recovered) | 97.22% | 91.08% | Total CPU Util: 64.67% CPUO\_Uti l:83.87% CPU4 \_
Util: 54.23% CPU7 Util:20.52% | 1.Test duration: ~40 min |
| cpu dryston 95% | 6.12 | 2.07 | 26.20 | 33.90 | 91.49 | 95.0 | Yes (Triggered five times during last 5 mins and
then recovered) | 97.22% | 91.08% | Total CPU Util: 64.67% CPUO\_Uti l:83.87% CPU4 \_
Util: 54.23% CPU7 Util:20.52% | 1.Test duration: ~40 min |
| BT paired | 6.12 | 2.07 | 26.20 | 33.90 | 91.49 | 95.0 | Yes (Triggered five times during last 5 mins and
then recovered) | 97.22% | 91.08% | Total CPU Util: 64.67% CPUO\_Uti l:83.87% CPU4 \_
Util: 54.23% CPU7 Util:20.52% | 1.Test duration: ~40 min |
| Audio playback | 6.12 | 2.07 | 26.20 | 33.90 | 91.49 | 95.0 | Yes (Triggered five times during last 5 mins and
then recovered) | 97.22% | 91.08% | Total CPU Util: 64.67% CPUO\_Uti l:83.87% CPU4 \_
Util: 54.23% CPU7 Util:20.52% | 1.Test duration: ~40 min |
| lperf3 100Mbps via wifi | 6.12 | 2.07 | 26.20 | 33.90 | 91.49 | 95.0 | Yes (Triggered five times during last 5 mins and
then recovered) | 97.22% | 91.08% | Total CPU Util: 64.67% CPUO\_Uti l:83.87% CPU4 \_
Util: 54.23% CPU7 Util:20.52% | 1.Test duration: ~40 min |
| lperf3 1Gbps via ethernet | 6.12 | 2.07 | 26.20 | 33.90 | 91.49 | 95.0 | Yes (Triggered five times during last 5 mins and
then recovered) | 97.22% | 91.08% | Total CPU Util: 64.67% CPUO\_Uti l:83.87% CPU4 \_
Util: 54.23% CPU7 Util:20.52% | 1.Test duration: ~40 min |
| | | | | | | | | | | | |
| | | | | | | | | | | | |
| | | | | | | | | | | | |
| | | | | | | | | | | | |
| | | | | | | | | | | | |
| | | | | | | | | | | | |
| | | | | | | | | | | | |
| Case | SOM@4.2V(in W) | interposer@4.2V(in W) | Ta | Tj start | last5min\_ Tj\_Avgr(℃) | Tj\_ Max(℃) | LMH | cdsp loading | GPU loading | CPU loading | Comment |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 5Camera (3xlMX577 720p30fps preview + recording,2xOV9282
720p30fps RDI dump) | 6.12 | 2.07 | 26.20 | 33.90 | 91.49 | 95.0 | Yes (Triggered five times during last 5 mins and
then recovered) | 97.22% | 91.08% | Total CPU Util: 64.67% CPUO\_Uti l:83.87% CPU4 \_
Util: 54.23% CPU7 Util:20.52% | 1.Test duration: ~40 min |
| 4ML QNN run on HTP | 6.12 | 2.07 | 26.20 | 33.90 | 91.49 | 95.0 | Yes (Triggered five times during last 5 mins and
then recovered) | 97.22% | 91.08% | Total CPU Util: 64.67% CPUO\_Uti l:83.87% CPU4 \_
Util: 54.23% CPU7 Util:20.52% | 1.Test duration: ~40 min |
| 2 QNN run on GPU | 6.12 | 2.07 | 26.20 | 33.90 | 91.49 | 95.0 | Yes (Triggered five times during last 5 mins and
then recovered) | 97.22% | 91.08% | Total CPU Util: 64.67% CPUO\_Uti l:83.87% CPU4 \_
Util: 54.23% CPU7 Util:20.52% | 1.Test duration: ~40 min |
| cpu dryston 95% | 6.12 | 2.07 | 26.20 | 33.90 | 91.49 | 95.0 | Yes (Triggered five times during last 5 mins and
then recovered) | 97.22% | 91.08% | Total CPU Util: 64.67% CPUO\_Uti l:83.87% CPU4 \_
Util: 54.23% CPU7 Util:20.52% | 1.Test duration: ~40 min |
| | | | | | | | | | | | |
| | | | | | | | | | | | |
| | | | | | | | | | | | |
Test results subject to change with different design and total system power.
Note:
- SOM power includes: SoC, PMICs, memory (RAM+FLASH), Wifi, GNSS (if
used)
- Interposer power includes: QPS615 PCIE bridge chip, PCIE to USB bridge chip,
Ethernet PHY chips for2.5GbE/10GbE (if used)
## Test case example 1 and 2: detailed summary table
Table : Internal thermal test results on QCS6490 RB3 Gen 2 platform
| **Iterations** | **Usecase** | **System Power**
**SOM+Interposer**
**(W)** | **SOM power**
**SOC+PMIC+DDR+wifi+Gnss** **(If used)**
**(W)** | **Thermal solutions** | **Ambient** | **SOC temperature**
**(℃)** | **LMH triggered** | **Test duration** |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Case 1 | vML for GPU and HTP is running Tflite + QNN
v5 camera is 3xIMX577
720p30fps preview +recording, 2xOV9282 720p30fps RDI
dump)
CPU drystone 30%+1GPU+1HTP+5camera | 4.87+2.04 = 6.91 | 4.87 | Baseplate heatsink | 26 | <95 | no | -- |
| Case 2 | vML for GPU and HTP is running Tflite + QNN
v5 camera is 3xIMX577
720p30fps preview +recording, 2xOV9282 720p30fps RDI
dump)
CPU drystone 45%+1GPU+1HTP+5camera | 5.31+2.03=7.34 | 5.31 | Baseplate heatsink | 26 | <95 | no | -- |
| Case 3 | vML for GPU and HTP is running Tflite + QNN
v5 camera is 3xIMX577
720p30fps preview +recording, 2xOV9282 720p30fps RDI
dump)
CPU drystone 60%+1GPU+1HTP+5camera | 5.39+2.06=7.45 | 5.39 | Baseplate heatsink | 26 | <95 | no | -- |
| Case 4 | 5Camera(3xIMX577
720p30fps preview + recording,2xOV9282 720p30fps RDI
dump)
2 QNN run on HTP
1 QNN run on GPU
CPU drystone 60% | 6.12+2.07 = 8.19 | 6.12 | Baseplate heatsink | 26 | 95.8 | yes | 40min |
| Case 5 | vML for GPU and HTP is running Tflite + QNN
v5 camera is 3xIMX577
720p30fps preview +recording, 2xOV9282 720p30fps RDI
dump)
CPU drystone 30%+1GPU+1HTP+5camera | 4.31+2.03 =6.34 | 4.31 | Baseplate Heatsink + Fan | 26 | <95 | no | -- |
| Case 6 | vML for GPU and HTP is running Tflite + QNN
v5 camera is 3xIMX577
720p30fps preview +recording, 2xOV9282 720p30fps RDI
dump)
CPU drystone 60%+1GPU+1HTP+5camera | 4.6+2.03 = 6.63 | 4.6 | Baseplate Heatsink + Fan | 26 | <95 | no | - |
| Case 7 | vML for GPU and HTP is running Tflite + QNN
v5 camera is 3xIMX577
720p30fps preview +recording, 2xOV9282 720p30fps RDI
dump)
CPU drystone 80%+1GPU+1HTP+5camera | 5.77+2.02 = 7.79 | 5.77 | Baseplate Heatsink + Fan | 26 | <95 | no | - |
| Case 8 | 5Camera(3xIMX577
720p30fps preview + recording,2xOV9282 720p30fps RDI
dump)
4ML QNN run on HTP
2QNN run on GPU
CPU drystone 95%
BT paired
Audio playback
Iperf3 100Mbps via wifi
Iperf 3 1Gbps via ethernet | 8.56+2.31 = 10.87 | 8.56 | Baseplate Heatsink + Fan | 26 | <95 = 85 | no | 40min |
## FAQs
**Q**: How to assign power in thermal model of chipset?
**A** : For all Qualcomm chipsets, thermal models are available in Icepak(.tzr)
and flotherm(pdml) format. Assign the power to the heat source in the thermal model.
The dimension of the heat source changes with thermal model.
**Q**: What are the use cases that need to be considered for QCS6490?
**A**: See the thermal power projection table in *QCM6490 and QCS6490, QCM5430 and QCS5430 Technical Reference Manual* (80-20659-5) for all the high-power
use cases. CPU intensive (Drystone) is the worst-case scenario.
**Parent Topic:** [References](https://docs.qualcomm.com/doc/80-70014-251/topic/references.html)
Last Published: Jan 28, 2026
[Previous Topic
DIP switches](https://docs.qualcomm.com/bundle/publicresource/80-70014-251/topics/rb3_dip_switches.md) [Next Topic
Related documents](https://docs.qualcomm.com/bundle/publicresource/80-70014-251/topics/rel-docs.md)