Techspot: I have had my eye on the original Silverstone Raven RV01 for quite some time. Released in late 2008, the case quickly caught my attention because of its strange orientation that pointed the motherboard upward at a 90-degree angle, so the "rear" I/O panel was placed on top of the enclosure instead of behind. Silverstone dubbed this layout style the "stack effect".
The Raven's exhaust fans were located on top instead of in the back. The idea seemed simple: when the internal components such as the CPU and GPU start to heat up, that heat rises creating the stack effect. Rather than fight this natural phenomenon, Silverstone decided to work with it.