Overclocking a Raspberry Pi

1. If you have already JDK7 installed remove it with $ sudo apt-get remove openjdk-7-jre 2. Use $ wget http://www.java.net/download/jdk8/archive/b117/binaries/jdk-8-ea-b117-linux-arm-vfp-hflt-20_nov_2013.tar.gz to download JDK8 (this one is only for ARM chips) 3. Now use the followning commands for installing: $ sudo tar zxvf jdk-8-ea-b117-linux-arm-vfp-hflt-20_nov_2013.tar.gz –C /opt then $ sudo update-alternatives –install “/usr/bin/java” “java” “/opt/jdk1.8.0/bin/java” 1 at last use $ java -version

1. To install HWBOT Prime you only need to download the .JAR with $ wget http://downloads.hwbot.org/hwbotprime.jar 2. Use $ java -jar hwbotprime.jar to run the benchmarks on the default specs.

1. Run the following commands to install OpenArena: $ sudo apt-get install openarena then use $ wget http://www.berryterminal.com/dl/ioquake3_99.1.36-rpi01_armhf.deb and at last use $ sudo dpkg -i ./ioquake3_99.1.36-rpi01_armhf.deb 2. Now use $ sudo apt-get clean to remove the leftovers

1. Go to the config.txt with this command: $ sudo nano /boot/config.txt 2. You will see a lot of options but you can skip the most of them, here is a list with the important options and there explannation: frequency overclocking arm_freq – ARM frequency, default = 700MHz gpu_freq – GPU frequency, default = 250MHz dram_freq – SDRAM frequency, default = 500MHz core_freq – GPU core frequency, has an impact on ARM performance since it drives L2 cache h264_freq – frequency of the hardware video block isp_freq – frequency of the image sensor pipeline block v3d_freq – frequency of the 3D block Voltage overclocking (!) The voltages can’t be chosen individually, they will al be set to the lowest voltage (!) (!) The minium is -16 the maxium 8, every step is 0.025 volt. The default is 0, with 1.2 volt (!) over_voltage – ARM and GPU core voltage adjustment, default over_voltage_sdram – sets all other SDRAM voltages together over_voltage_sdram_c – SDRAM controller voltage adjustment over_voltage_sdram_i – SDRAM I/O voltage adjustment over_voltage_sdram_p – SDRAM phy voltage adjustment 3. You can use your mouse and keyboard to change the values 4. Exit with Esc and reboot your Raspberry Pi

1. Turn off your Raspberry Pi (unplug the power) and take your SD card 2. Insert your SD card into your computer and go to the folder Boot 3. Open the config.txt with your preferred text editor 4. You will see a lot of options but you can skip the most of them, here is a list with the important options and there explannation:

frequency overclocking arm_freq – ARM frequency, default = 700MHz gpu_freq – GPU frequency, default = 250MHz dram_freq – SDRAM frequency, default = 500MHz core_freq – GPU core frequency, has an impact on ARM performance since it drives L2 cache h264_freq – frequency of the hardware video block isp_freq – frequency of the image sensor pipeline block v3d_freq – frequency of the 3D block Voltage overclocking (!) The voltages can’t be chosen individually, they will al be set to the lowest voltage (!) (!) The minium is -16 the maxium 8, every step is 0.025 volt. The default is 0, with 1.2 volt (!) over_voltage – ARM and GPU core voltage adjustment, default over_voltage_sdram – sets all other SDRAM voltages together over_voltage_sdram_c – SDRAM controller voltage adjustment over_voltage_sdram_i – SDRAM I/O voltage adjustment over_voltage_sdram_p – SDRAM phy voltage adjustment 5. Now edit the values and reinsert your SD card to your Raspberry Pi