Customer note: Stock from September 27th 2011 onwards is the new USB3.0 version of the define R3. There is 1x USB3.0 port on the front panel as well as 2x USB2.0 ports As the name implies, Define XL is the larger sibling of the acclaimed & award winning Define R2/R3 case. It is similar to the Define R2/R3, & offers a number of interesting functions with a very stylish appearance. It is a case focused on low noise level, without neglecting other important features such as cooling, expandability & ease of use. Features Stylish design Pre-fitted with noise absorbing material Configurable thermal chamber design Great cooling possibilities, 3x fans included (2x 140mm, 1x 180mm) 10x HDD slots Unique Modu Vent™ design in side panel An important feature of the XL is the division into three thermal chamber designs. This enables the user to freely choose the best thermal configuration suited for their needs. 1. The upper main chamber, contains most of the components, such as motherboard, ODD & one HDD cage. This main chamber is cooled by one 140mm fan in the front (included), one 120mm fan in the front (optional), one 140mm fan in the rear (included), one 120 or 140mm fan in the side panel (optional) & one 180mm fan in the top (included). The top 180mm fan is mounted at an angle, blowing out hot air through the rear side of the case. As mentioned earlier, the top cover has a clear acoustic advantage in that it prevents noise being emitted from the top of the case. 2. The second thermal chamber (PSU chamber) is connected to the main chamber with a removable lid. Due to the lid being removable, it is possible to turn the PSU upside down which will then expel air from within the main chamber. Alternatively the PSU can be installed with the fan facing the bottom of the case. Air is then brought into the PSU from underneath the case through the supplied air filter. 3. The third chamber is the lower HDD chamber, consisting of room for six hard drives. This chamber is cooled by an optional 140mm fan at the front. By default the air flows over the HDDs & therefore becomes warm. It then exits the system behind the right side panel (seen from the front) & out of the rear of the case. However, the user can decide to remove the dividing metal panel between the lower HDD chamber & the PSU chamber, to let the air flow over the PSU & out of the rear ventilation holes. Another unique feature with the XL is the Modu Vent™, inherited from the Define R2/R3 case. This is a cover fitted with noise absorbing material, mounted in the side panel fan aperture, allowing the user to choose between an optimal low noise level, having the cover mounted or optimal airflow by removing the cover & mounting a fan for air intake. Dimensions 232 x 560 x 561.3mm Weight 17.95kg Motherboard Compatibility Mini ITX, Micro ATX, ATX & E-ATX Power Supply Compatibility Standard ATX, can accommodate long PSUs PCI/AGP Card Compatibility Full size, any length 3.5" Drive Bays 10, all SSD compatible 5.25" Drive Bays 4, one bay converts to 3.5" for floppy or card reader Roof Cooling Fans 1x 180mm fan (supplied) Rear/ Side Cooling Fans Side 1x 120 or 140mm side fan (not supplied), Rear 1x 140mm rear fan (supplied) Front/ Floor Cooling Fans Front 2x 140mm fan (one supplied), 1x 120mm fan (not supplied) Expansion Card Slots 7, with sleek white painted brackets Front I/O Ports 1x USB3.0, 1x USB (Universal Serial Bus) 2.0, 1x e SATA & Audio I/O Accessories PCI fan controller, controllers up to 3 fans