In Mac OS X: Leopard, the System Profiler can be used to find technical specs on your mac such as the processor type and speed, type of cache, and the file system. For you Windows users, it’s basically the same as the System Information application. There are many ways to open the System Profiler:

• Launch it from the /Applications/Utilites folder.
• Hold down the Option key while choosing Apple > About This Mac, and the menu item will change to System Profiler.
• Choose Apple > About This Mac and click More Info…