Celeron 400Mghz Processor 

and Fan

Celeron is Intel Pentium's Low end model and 400Mghz refers to the amount of speed that the processor goes, 400 Megahertz. The chips dimensions with fan are (L 2" X W 2" X D 2"). I have chosen to go with an Intel because intel is the only type of chip that will work with a Flex ATX Motherboard as Intel created the standard for the board.