You can do other things but this particular script is just to set all AMD cards to 80% fan speed (remember this script needs to applied everytime you reboot). You could set it is a cron or just throw it into /etc/rc.local
for hwmon in `ls -1 /sys/class/drm|grep card[0-99]$`; do
hwmonname=`ls $basepath/$hwmon/device/hwmon|grep hwmon[0-99]`
echo "echo 1 > $hwmonpath/pwm1_enable"
echo "echo 205 > $hwmonpath/pwm1"
echo 1 > $hwmonpath/pwm1_enable
echo 205 > $hwmonpath/pwm1
The way it works is as follows:
The card power play settings are located in:
The card number is also the same order that you'll find in say Claymore and the hwmon number is usually 1 less than your card number. So as you can see below card4's hwmon path is hwmon3.
In the script I account for that just in case it may be different though.
#enable pwm (if the value is not 1 it is not enabled so setting the fan speed would have no effect)
echo 1 > /sys/class/drm/card4/device/hwmon/hwmon3/pwm1_enable
The parameters for fan speed are a percentage or number out of max 255. So 80% would be the number 205 (it also seems to round to the nearest 5% I believe)
# 210/255 is about 82% fan speed (this still resulted in 80% actual fan speed)
echo "210" > /sys/class/drm/card4/device/hwmon/hwmon3/pwm1
The results of higher fan speeds
In one of my test rigs see that on some cards the temperature reduced by about 14C degrees!
ETH: GPU0 t=72C fan=64%, GPU1 t=72C fan=63%, GPU2 t=69C fan=23%, GPU3 t=84C fan=0%, GPU4 t=69C fan=27%
ETH: GPU0 30.457 Mh/s, GPU1 30.455 Mh/s, GPU2 29.473 Mh/s, GPU3 29.498 Mh/s, GPU4 29.484 Mh/s
GPU0 t=65C fan=80%, GPU1 t=71C fan=80%, GPU2 t=55C fan=80%, GPU3 t=57C fan=80%, GPU4 t=55C fan=80%