Bjorn3D posted a review on the NZXT Phantom 820 Full-Tower Gaming Chassis

Many believe that computer chassis are only for looks, and that they do not affect the performance of a system. In most cases this is true, as long as the system built does not overpower the cooling capabilities of a chassis. However, there is a lot more to a computer chassis than just cooling performance and aesthetics. These other factors have to do with ease of use when it comes to upgrading, specific hardware support, full control over the internal settings of the chassis, including fans, LEDs, measuring probes, etc., the build quality of the chassis, how easy it is to maintain or clean the dust that gathers inside and outside the system, how quiet the system runs and potential settings to change the audibility of the system, and for most gamers, perhaps even the weight and size of the chassis. There are lot more factors to consider when choosing your next chassis for your system, but most people will stick with their old one just because upgrading their chassis would not necessarily gain them any performance, while a Solid State Drive (SSD), a new Processor, Memory, or a new GPU for example would have a big difference in everyday productivity. While any system that runs super fast is fun to mess around with, it can also become the opposite if you have to deal with lots of fan noise, poor hardware support, poor quality chassis that vibrates, and even unattractive aesthetics.

  NZXT Phantom 820 Full-Tower Gaming Chassis Review