CPU-Z is a freeware system profiler application for Microsoft Winows (for all versions from 95 on) that detects the central processing unit, RAM, motherboard chipset, and other hardware features of a modern personal computer, and presents the information in one window. CPU-Z is more in-depth in some areas than the features that Windows XP provides to identify various hardware components, and is thus needed to identify certain components without opening the case, especially the core revision and RAM clock rate. It has an unusual ability to directly detect hardware features, especially the ability to access, read and display the SPD data from memory modules. The ability to document clock speed makes it an important tool for motherboard overclockers, as a way of proving the CPU speeds achieved by various experiments.