System Information Viewer is a general Windows utility for displaying lots of useful Windows, Network and hardware info - CPU info, PCI info, PCMCIA info, USB info SMBus info, SPD info, ACPI methods, Machine info, Hardware Sensors, Networked computers, Operating System Information and more. It is a freeware system information application that's comprehensive, portable and light on system resources.
Here are some screenshots to illustrate the features and user interface of this application: