Speccy is a freeware system information tool from Piriform, for windows. Portable and installable versions are available.
This is another system tool from Piriform. Speccy can help you find useful information about your computer. When you run this program it will automatically analyze your system. Then it will be able to show you a summary report about your OS, CPU, RAM, motherboard, graphics, Hard disks, Optical drives, audio. More details can be found easily. Just click on "CPU" for example and you will find out how many cores has your CPU, the number of threads it can handle simultaneously, CPU socket, family, model ,stepping, supported instruction sets (MMx, SSE, 3DNow! etc...), bus speed, core speed, temperature etc...
Speccy run's fine under Win XP, Vista, Win 7
The "exe" file contains the installable version of Speccy and "zip" file the portable.
Enjoy!