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How can I overclock Raspberry PI 4 GPU/core/video core to more then 600MHz?

Fri Jul 12, 2019 1:57 pm

How can I overclock Raspberry pi 4 GPU/video core to more then 600MHz?
when I change gpu_freq(in config.txt) to more then 600 for example 620 like in tom's hardware overclocking guide for Pi4
It will end up like
core 500 MHz
v3d 375MHz
h264 375MHz

It is same when I change gpu_freq to 700 :(

When I set gpu_freq=600 I get
core 600 MHz
v3d 600 MHz
h264 600 MHz

I get freq. with this
vcgencmd measure_clock arm
vcgencmd measure_clock core
vcgencmd measure_clock h264
vcgencmd measure_clock v3d


Any idea how can I overclock to more then 600MHz?

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generaleramon
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Re: How can I overclock Raspberry PI 4 GPU/core/video core to more then 600MHz?

Tue Jul 16, 2019 11:41 am

same problem/question here...seems like a lot of functions are missing/disabled in the RPI4... :roll:
like the dinamic voltage, not working, i can change the voltage by setting both over_voltage and over_voltage_min at the same value :?:
sdram overclock: i can set it from 3200 to 3600 but i can't see any real difference :?:
a lot of stuff is not in the documentation or it's disabled

and by setting gpu_fre=600 ypu are setting the boost clock, if you run a heavy opengl load the gpu will downlock to 500Mhz :|

timg236
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Re: How can I overclock Raspberry PI 4 GPU/core/video core to more then 600MHz?

Tue Jul 16, 2019 2:19 pm

generaleramon wrote:
Tue Jul 16, 2019 11:41 am
sdram overclock: i can set it from 3200 to 3600 but i can't see any real difference :?:
The SDRAM frequency for Pi4 is fixed at boot and the only supported value for the data rate is sdram_freq is 3200 (*), other values are ignored. Above this then the bus infrastructure will be the limiting factor so you would see little or no benefit.

Lower rates might be supported in future for power saving but so far it doesn't look to be a big win.

(*) There's a failsafe 1350 config but that isn't recommended for normal usage.

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generaleramon
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Re: How can I overclock Raspberry PI 4 GPU/core/video core to more then 600MHz?

Tue Jul 16, 2019 4:05 pm

timg236 wrote:
Tue Jul 16, 2019 2:19 pm
generaleramon wrote:
Tue Jul 16, 2019 11:41 am
sdram overclock: i can set it from 3200 to 3600 but i can't see any real difference :?:
The SDRAM frequency for Pi4 is fixed at boot and the only supported value for the data rate is sdram_freq is 3200 (*), other values are ignored. Above this then the bus infrastructure will be the limiting factor so you would see little or no benefit.

Lower rates might be supported in future for power saving but so far it doesn't look to be a big win.

(*) There's a failsafe 1350 config but that isn't recommended for normal usage.
nice to know, but why is this not included in the dedicated page? https://www.raspberrypi.org/documentati ... locking.md where should i find other informations?
hdmi_blanking and sd_overclock also seems to be not working
is "over_voltage_sdram" supported?
will sdram overclocking be enabled in the future?

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RaTTuS
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Re: How can I overclock Raspberry PI 4 GPU/core/video core to more then 600MHz?

Tue Jul 16, 2019 4:23 pm

generaleramon wrote:
Tue Jul 16, 2019 4:05 pm
...

nice to know, but why is this not included in the dedicated page? https://www.raspberrypi.org/documentati ... locking.md where should i find other informations?
hdmi_blanking and sd_overclock also seems to be not working
is "over_voltage_sdram" supported?
will sdram overclocking be enabled in the future?
as that ony mentions pi <4 then it's not been ujpdated
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generaleramon
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Re: How can I overclock Raspberry PI 4 GPU/core/video core to more then 600MHz?

Tue Jul 16, 2019 4:31 pm

RaTTuS wrote:
Tue Jul 16, 2019 4:23 pm
generaleramon wrote:
Tue Jul 16, 2019 4:05 pm
...

nice to know, but why is this not included in the dedicated page? https://www.raspberrypi.org/documentati ... locking.md where should i find other informations?
hdmi_blanking and sd_overclock also seems to be not working
is "over_voltage_sdram" supported?
will sdram overclocking be enabled in the future?
as that ony mentions pi <4 then it's not been ujpdated
"4B" is named 6 times in that page
updated 22days ago on GitHub (https://github.com/raspberrypi/document ... locking.md)

timg236
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Posts: 116
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Re: How can I overclock Raspberry PI 4 GPU/core/video core to more then 600MHz?

Tue Jul 16, 2019 4:59 pm

generaleramon wrote:
Tue Jul 16, 2019 4:05 pm
nice to know, but why is this not included in the dedicated page? https://www.raspberrypi.org/documentati ... locking.md where should i find other informations?
hdmi_blanking and sd_overclock also seems to be not working
is "over_voltage_sdram" supported?
will sdram overclocking be enabled in the future?
If you find documentation that's missing / wrong then please raise an Issue on the appropriate Github page. That way it should make it on to the TODO list!

Over the years many config tweaks have been added, the ones that are very hardware specific but only used by expert users are more likely to have been missed on hardware blocks which have been replaced on Pi4. E.g. Pi4 has a completely different DDR PHY to support LPDDR4 and the HDMI PHY is very different to support HDMI 2.0

SDRAM over-clocking support is unlikely to be added at any point in the near future, it would be a lot of work, maybe a fixed higher data rate but it's definitely not just a case of exposing a parameter to tweak.

For HDMI blanking see https://github.com/raspberrypi/linux/issues/3050 more likely to happen sooner because potentially bits of the display pipeline can be turned off allowing the core clock to be reduced to save power.

jamesh
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Re: How can I overclock Raspberry PI 4 GPU/core/video core to more then 600MHz?

Tue Jul 16, 2019 5:23 pm

generaleramon wrote:
Tue Jul 16, 2019 4:31 pm
RaTTuS wrote:
Tue Jul 16, 2019 4:23 pm
generaleramon wrote:
Tue Jul 16, 2019 4:05 pm
...

nice to know, but why is this not included in the dedicated page? https://www.raspberrypi.org/documentati ... locking.md where should i find other informations?
hdmi_blanking and sd_overclock also seems to be not working
is "over_voltage_sdram" supported?
will sdram overclocking be enabled in the future?
as that ony mentions pi <4 then it's not been ujpdated
"4B" is named 6 times in that page
updated 22days ago on GitHub (https://github.com/raspberrypi/document ... locking.md)
I updated the page with what I knew at the time. Obviously a few small tweaks needed. Please add an issue to our docs github tracker linking back to this thread.
Principal Software Engineer at Raspberry Pi (Trading) Ltd.
Contrary to popular belief, humorous signatures are allowed. Here's an example...
"My grief counseller just died, luckily, he was so good, I didn't care."

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generaleramon
Posts: 7
Joined: Thu Oct 25, 2018 9:52 am

Re: How can I overclock Raspberry PI 4 GPU/core/video core to more then 600MHz?

Tue Jul 16, 2019 9:13 pm

jamesh wrote:
Tue Jul 16, 2019 5:23 pm
generaleramon wrote:
Tue Jul 16, 2019 4:31 pm
RaTTuS wrote:
Tue Jul 16, 2019 4:23 pm


as that ony mentions pi <4 then it's not been ujpdated
"4B" is named 6 times in that page
updated 22days ago on GitHub (https://github.com/raspberrypi/document ... locking.md)
I updated the page with what I knew at the time. Obviously a few small tweaks needed. Please add an issue to our docs github tracker linking back to this thread.
Done! https://github.com/raspberrypi/document ... ssues/1202

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