# Why is the "GPU clock speed" measured by PVRScope inconsistent with the result measured by PVRTune

**URL:** <https://forums.imgtec.com/t/why-is-the-gpu-clock-speed-measured-by-pvrscope-inconsistent-with-the-result-measured-by-pvrtune/4147>\
**Category:** Uncategorized\
**Tags:** pvrscope\
**Created:** [March 31, 2025, 9:08am UTC](https://forums.imgtec.com/t/why-is-the-gpu-clock-speed-measured-by-pvrscope-inconsistent-with-the-result-measured-by-pvrtune/4147 "2025-03-31T09:08:26Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![AlejandroC](https://avatars.discourse-cdn.com/v4/letter/a/97f17d/32.png) [@AlejandroC](https://forums.imgtec.com/u/AlejandroC)\
**Post date:** [April 7, 2025, 12:07pm UTC](https://forums.imgtec.com/t/why-is-the-gpu-clock-speed-measured-by-pvrscope-inconsistent-with-the-result-measured-by-pvrtune/4147/4 "2025-04-07T12:07:17Z")

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Hi niubaty,

Thanks for your message.

Regarding the `GPU clock speed` GPU counter not showing any information, please make sure to:

- Install PVRPerfServerDeveloper on the device you are taking recordings from.
- If you have used more than one PVRTune version, then make sure that there is a match between the version installed in the device and the PVRTune version you are using to take any recordings.

Regarding data volatility, the Renderer Active GPU counter is a binary counter (it either has a value of 0% or 100%):

 ![image](https://us1.discourse-cdn.com/flex015/uploads/imagination1/original/1X/72cd827d02dd8ae76a0073bcf645b2f3a32247de.png)

I can see in the file provided entries like “Renderer active: 77.362137%”, please for that GPU counter treat its value as _value 0 → Renderer not active, value \> 0 → Renderer active_.

Also, for comparing the values from PVRTune and the values from PVRScope, are you exporting the values from PVRTune as a .csv? (using `File -> Export -> Export raw data to .csv`). In that case, there is a PVRTune issue which was reported on a different thread ( [How to get Geometry active value from exported .csv file? - #9 by AlejandroC](https://forums.imgtec.com/t/how-to-get-geometry-active-value-from-exported-csv-file/4026/9) ) and was fixed internally. The fix will be included in the next PVRTune release (I can also provide an engineering drop if you need it).

Best regards,  
Alejandro

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