The free GPU Observer provides in the Windows Sidebar useful detailed information about the inner workings of graphics cards made by AMD and Nvidia. The tool reads data such as current temperature of the graphics card, GPU clock speed and fan speeds. GPU Observer is based on the applications used by AMD and Nvidia in their Windows drivers APIs to collect the status of the GPU and other hardware information. For multiple graphics cards can often operate the gadget any parallel. Even the introduced with Windows 7 mixed operation of ATI and Nvidia graphics cards supports freeware. The data displayed, including temperature of the GPU fan speed and load of the graphics card, one defines a checkbox in the settings of the gadget. GPU Observer provides graphics card enthusiasts useful information about the state of their graphics accelerator in real time. both overclockers and fans of Silent PCs are likely to be in favor of the desktop gadget.