Thermaltake expanded their mid-tower range of cases with the M9D earlier this year. It's available with or without the window in the side panel and it features a huge 23cm fan on the side to help cool down the hardware inside. It's a trend these days to incorporate a larger fan into the case, Antec is doing it and so are some of the other manufacturers. The larger the fan, the slower the RPM, but the higher the CFM. Which is the whole idea behind these types of fans. Let's see if it works out for the M9D casing.