http://www.passmark.com/products/bit.htm

BurnInTest tests the CPU, hard drives, RAM, CD-ROMs, CD burners, DVDs, sound cards, 2D graphics, 3D graphic, network connection, printers, video playback. If you have specialized hardware that BurnInTest does not test, you can even write your own test and integrate it with BurnInTest. PassMark has produced plugin tests for Keyboards, Dial up Modems and FireWire ports. This can all be done simultaneously as the application is multithreaded. The Professional version also has a number of additional features such as tape drive testing, USB port testing, USB 2.0 port testing, Serial and parallel port testing with the use of loop back plugs.