PC WIZARD 2008 is among the most advanced system information programs on the market. It is a powerful utility designed especially for detection of hardware, but also some more analysis. It's able to identify a large scale of system components and supports the latest technologies and standards. This tool is periodically updated, usually once per month in order to provide most accurate results.
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It is designed to analyze and benchmark your computer system. It can analyze and benchmark many kinds of hardware, such as CPU performance, Cache performance, RAM performance, Hard Disk performance, CD/DVD-ROM performance, Removable/FLASH Media performance, Video performance, MP3 compression performance.
Although it is designed for Vista, it works well with XP also
Best Free System Information Utility 
