Overclock the S905Y2?

remove turbo-mode; from the overlay or create a script and service.

paste the following into a terminal:

sudo tee /usr/bin/tweaks <<EOF
#!/bin/bash

if [ -f /sys/devices/system/cpu/cpufreq/boost ]; then
	echo "1" > /sys/devices/system/cpu/cpufreq/boost;
fi
EOF
sudo chmod +x /usr/bin/tweaks
sudo tee /etc/systemd/system/tweaks.service <<EOF
[Unit]
Description=Radxa Zero System Tweaks
ConditionFileIsExecutable=/usr/bin/tweaks
After=sysinit.target local-fs.target network.target bluetooth.target

[Service]
Type=forking
ExecStart=/usr/bin/tweaks
TimeoutSec=0
RemainAfterExit=yes
StandardOutput=journal+console
StandardError=journal+console

[Install]
WantedBy=multi-user.target
EOF
sudo systemctl enable tweaks
sudo systemctl start tweaks