The P100 is an ATX case that opitimizes cool, quiet, and sophistication. It features Antec's award winning the Performance One series design and Quiet Computing™ technologies that minimize system noise. In addition to 7 expansion slots, the P100 also supports 2 tool-less 5.25" drives and 7 tool-less 3.5"/ 2.5" drives. With a great price to feature ratio the P100 is the only economical case that delivers first class silence performance. A balance of price and feature is achieved by integrating Antec design with superior build quality. Engineered with Quiet Computing™ Technology, the P100 is truly in a class all its own.