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‎README.md

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# MiSTer FPGA Overclock Scripts
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Works in conjunction with the [MiSTer FPGA Overclock Kernel](https://github.com/coolbho3k/Linux-Kernel_MiSTer/releases/) to overclock or underclock your MiSTer system.
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## Warning
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- Active cooling or very good passive cooling required!
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- Overclock/underclock at your own risk!
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- These scripts are licensed under GPLv3, so they come with no warranty.
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## How to use
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Copy all the scripts to the `Scripts` directory on your SD card.
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The kernel driver's default behavior is to keep the MiSTer at 800 MHz (stock) until you run one of these scripts.
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- Run `set_cpu_max_1200.sh` to set max clock speed to 1.2 GHz
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- Run `set_cpu_max_1000.sh` to set max clock speed to 1.0 GHz
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- Run `set_cpu_max_800.sh` to set max clock speed to 800 MHz (stock)
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- Run `set_cpu_max_400.sh` to set max clock speed to 400MHz

‎set_cpu_max_1000.sh

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#!/bin/bash
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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if [ ! -f "/media/fat/MiSTer" ];
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then
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echo "This script must be run"
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echo "on a MiSTer system."
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exit 1
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fi
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if [ ! -f "/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq" ];
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then
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echo "This script must be run"
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echo "on a kernel with cpufreq driver."
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exit 1
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fi
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echo "Warning: Active cooling required!"
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echo "Warning: Overclock/underclock at your own risk!"
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echo "This script comes with no warranty"
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echo "Press UP to proceed, press DOWN to abort"
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for (( ; ; )); do
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read -r -s -N 1 -t 1 key
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if [[ "${key}" == "A" ]]; then
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break
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elif [[ "${key}" == "B" ]]; then
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echo "Aborted script"
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exit 1
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break
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fi
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done
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echo "1000000" > "/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq"
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echo "Max CPU frequency set to 1000 MHz"

‎set_cpu_max_1200.sh

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#!/bin/bash
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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if [ ! -f "/media/fat/MiSTer" ];
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then
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echo "This script must be run"
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echo "on a MiSTer system."
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exit 1
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fi
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if [ ! -f "/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq" ];
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then
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echo "This script must be run"
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echo "on a kernel with cpufreq driver."
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exit 1
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fi
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echo "Warning: Active cooling required!"
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echo "Warning: Overclock/underclock at your own risk!"
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echo "This script comes with no warranty"
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echo "Press UP to proceed, press DOWN to abort"
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for (( ; ; )); do
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read -r -s -N 1 -t 1 key
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if [[ "${key}" == "A" ]]; then
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break
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elif [[ "${key}" == "B" ]]; then
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echo "Aborted script"
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exit 1
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break
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fi
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done
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echo "1200000" > "/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq"
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echo "Max CPU frequency set to 1200 MHz"

‎set_cpu_max_400.sh

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#!/bin/bash
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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if [ ! -f "/media/fat/MiSTer" ];
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then
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echo "This script must be run"
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echo "on a MiSTer system."
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exit 1
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fi
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if [ ! -f "/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq" ];
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then
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echo "This script must be run"
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echo "on a kernel with cpufreq driver."
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exit 1
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fi
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echo "Warning: Active cooling required!"
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echo "Warning: Overclock/underclock at your own risk!"
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echo "This script comes with no warranty"
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echo "Press UP to proceed, press DOWN to abort"
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for (( ; ; )); do
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read -r -s -N 1 -t 1 key
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if [[ "${key}" == "A" ]]; then
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break
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elif [[ "${key}" == "B" ]]; then
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echo "Aborted script"
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exit 1
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break
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fi
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done
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echo "400000" > "/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq"
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echo "Max CPU frequency set to 400 MHz"

‎set_cpu_max_800.sh

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#!/bin/bash
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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if [ ! -f "/media/fat/MiSTer" ];
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then
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echo "This script must be run"
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echo "on a MiSTer system."
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exit 1
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fi
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if [ ! -f "/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq" ];
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then
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echo "This script must be run"
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echo "on a kernel with cpufreq driver."
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exit 1
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fi
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echo "Warning: Active cooling required!"
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echo "Warning: Overclock/underclock at your own risk!"
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echo "This script comes with no warranty"
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echo "Press UP to proceed, press DOWN to abort"
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for (( ; ; )); do
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read -r -s -N 1 -t 1 key
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if [[ "${key}" == "A" ]]; then
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break
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elif [[ "${key}" == "B" ]]; then
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echo "Aborted script"
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exit 1
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break
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fi
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done
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echo "800000" > "/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq"
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echo "Max CPU frequency set to 800 MHz"

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