Dec 05, · Displays the temperatures, fan speed, voltages, system values (data input and output) and RAM's contents, cooling for Windows and change the frequency of your PC. ACPI (new feature since /5(). Feb 27, · Developer's Description. CPUCooL displays all units connected to an I2C bus. You can see the temperature, voltage, and fan values, and the values programmed in the E2PROM of the SDRAM. CPUCooL can.