Overclocking Rpi1 B+

General Discussion
1

I am using my Raspberry Pi as a headless server, currently running on overclock profile of safe.
“900 Mhz ARM, 250 MHz core, 400 MHz SDRAM, 2 overvolt”

I want the overclock to be extreme profile
“1025 MHz ARM, 500 MHz core, 400 MH SDRAM, 6 overvolt”
As I understand the core is for GPU (correct me if I am wrong), which I don’t really need it, so is it possible to just increase the ARM speed while leaving the core speed intact? (So I don’t have to overvolt too much)

Without using any knowledge of how these overclocking work.
With some simple math, i calculated my overvolt value will be 4 for “1025 Mhz ARM, 250 Mhz Core speed”

I will also want to reduce the arm_freq_min and core_freq_min - is this advisable? since it is a server and will be idle most of the time.

So in my config will it will be

over_voltage=4
arm_freq=1025
core_freq=250
#sdram_freq=400

arm_freq_min=500
core_freq_min=250
#sdram_freq_min=400

So is it advisable to apply the above config?
Or when I increase my arm_freq, I have to increase my core_freq as well

Thank you very much

2

Hi,

Yep, you can manually edit config.txt clocks if needed.

When avoid_pwm_pll=1 is set, GPU and core_freq are seperated. This is default on DietPi, unless ALSA is installed, in which case GPU and core_freq are linked.RPiconfig - eLinux.org

arm_freq_min and core_freq_min - is this advisable?

We tested this as a possible option in dietpi-config, however, it was too unstable in our testing:
https://github.com/Fourdee/DietPi/issues/73

3

Alright, thank you very much for the help and the source! Will try and update!

4

So far no crashing, running on
1025MHz arm, 250MHz Core, 400MHz and 4 overvolt. Seems to be running fine for now

5

Great to hear. RPi 1/2 overclock really well. Heat isn’t an issue, just stability. Hopefully it stays stable :slight_smile: