TanMath
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Cannot overclock --> black screen

Fri Jun 01, 2018 5:26 am

When I try to overclock my Raspberry Pi 3B by editing the boot/config.txt file and restart, I always end up with a black screen. It will go past the "Welcome to Raspberry Pi Desktop" screen but after that it displays this black screen. I am using the Raspberry Pi with Adafruit PowerBoost 1000C and with the Official Raspberry Pi Touchscreen.

What is going on? Are certain RPi3B's not overclockable?

jamesh
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Re: Cannot overclock --> black screen

Fri Jun 01, 2018 9:30 am

Some will overclock, some won't. Most 3B+ are already at maximum.

The clues in the word OVERclock. You are pushing the SoC beyond the design capacity so cannot expect it to work.
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Re: Cannot overclock --> black screen

Fri Jun 01, 2018 9:39 am

TanMath wrote:
Fri Jun 01, 2018 5:26 am
When I try to overclock my Raspberry Pi 3B by editing the boot/config.txt file and restart, I always end up with a black screen. It will go past the "Welcome to Raspberry Pi Desktop" screen but after that it displays this black screen. I am using the Raspberry Pi with Adafruit PowerBoost 1000C and with the Official Raspberry Pi Touchscreen.

What is going on? Are certain RPi3B's not overclockable?

The Adafruit PowerBoost 1000C may be struggling to supply adequate steady voltage ??

https://eltechs.com/overclock-raspberry-pi-3/
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TanMath
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Re: Cannot overclock --> black screen

Fri Jun 01, 2018 9:40 am

jamesh wrote:
Fri Jun 01, 2018 9:30 am
Some will overclock, some won't. Most 3B+ are already at maximum.
Note I am using a RPi3B, not RPi3B+
Last edited by TanMath on Fri Jun 01, 2018 9:42 am, edited 2 times in total.

wildfire
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Re: Cannot overclock --> black screen

Fri Jun 01, 2018 9:44 am

That makes no difference with Jamesh post.

You have a 1.2Ghz processor and it may or may not be capable of running faster.
Last edited by wildfire on Fri Jun 01, 2018 9:50 am, edited 1 time in total.
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TanMath
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Re: Cannot overclock --> black screen

Fri Jun 01, 2018 9:48 am

wildfire wrote:
Fri Jun 01, 2018 9:44 am
That makes no difference with Jamesh post.

You have a 1.2Ghz processor and it may or may not be cabable of running faster.
This could be true, but I was wondering if there are other things affecting it, like the power source as brought up by fruitoftheloom, and how to better determine those effects...

jamesh
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Re: Cannot overclock --> black screen

Fri Jun 01, 2018 9:53 am

TanMath wrote:
Fri Jun 01, 2018 9:48 am
wildfire wrote:
Fri Jun 01, 2018 9:44 am
That makes no difference with Jamesh post.

You have a 1.2Ghz processor and it may or may not be cabable of running faster.
This could be true, but I was wondering if there are other things affecting it, like the power source as brought up by fruitoftheloom, and how to better determine those effects...
Try with a decent power supply.

Perhaps increase the chip voltage. Might go a bit higher. Some people have got 1450 out of the 3B, others don't get anything. Depends on the chip.
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TanMath
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Re: Cannot overclock --> black screen

Fri Jun 01, 2018 10:06 am

jamesh wrote:
Fri Jun 01, 2018 9:53 am
TanMath wrote:
Fri Jun 01, 2018 9:48 am
wildfire wrote:
Fri Jun 01, 2018 9:44 am
That makes no difference with Jamesh post.

You have a 1.2Ghz processor and it may or may not be cabable of running faster.
This could be true, but I was wondering if there are other things affecting it, like the power source as brought up by fruitoftheloom, and how to better determine those effects...
Try with a decent power supply.

Perhaps increase the chip voltage. Might go a bit higher. Some people have got 1450 out of the 3B, others don't get anything. Depends on the chip.

I was simply trying with 1350 though:

Code: Select all

arm_freq=1350
core_freq=500
sdram_freq=500

over_voltage=6
What is the chip voltage parameter?

jamesh
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Re: Cannot overclock --> black screen

Fri Jun 01, 2018 7:59 pm

TanMath wrote:
Fri Jun 01, 2018 10:06 am
jamesh wrote:
Fri Jun 01, 2018 9:53 am
TanMath wrote:
Fri Jun 01, 2018 9:48 am


This could be true, but I was wondering if there are other things affecting it, like the power source as brought up by fruitoftheloom, and how to better determine those effects...
Try with a decent power supply.

Perhaps increase the chip voltage. Might go a bit higher. Some people have got 1450 out of the 3B, others don't get anything. Depends on the chip.

I was simply trying with 1350 though:

Code: Select all

arm_freq=1350
core_freq=500
sdram_freq=500

over_voltage=6
What is the chip voltage parameter?
Overvoltage. But that is lready 6 so I think that is maxed out.

1350 is quite a jump over the standard 1200, try something lower.
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bensimmo
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Re: Cannot overclock --> black screen

Fri Jun 01, 2018 8:08 pm

Try 1200 (default) with the settings.
If that works, try 1250, 1300.
Drop back and then add 10 as you go.

But that's a 1A max PowerSupply you have. 2.0/2.5A is the recommended.
I know my 3B will run of 1A, but i've never tried it overclocked.

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HawaiianPi
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Re: Cannot overclock --> black screen

Fri Jun 01, 2018 11:01 pm

TanMath wrote:
Fri Jun 01, 2018 10:06 am
I was simply trying with 1350 though...
No overclock is guaranteed. Overclocking, by it's very nature, is running the system beyond operating specifications. While many (if not most) systems can be overclocked (at least a little), the ability to overclock is not a feature. No one should purchase a system with the expectation that they will be able to overclock it.

This is especially true for the Raspberry Pi 3B series, which, in case you haven't noticed, is not supported for overclocking in the official Raspbian OS configuration utility.

Of course none of the above means it can't be done. You just need to manage your expectations.

Your 1A power supply is woefully inadequate to run even a stock Pi3B. Trying to overclock it on a 1A power supply is just a failure waiting to happen (in your case it happened immediately). Using a proper power supply *might* help, or you may just have a system that won't overclock.
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Re: Cannot overclock --> black screen

Mon Jun 04, 2018 10:12 am

1A is not enough, i have 2.1A psu and i still get the lightning bolt sign while my pi is overclocked at 1.36ghz over volt 3. Get a higher amp psu before overclocking.
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