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The matte dark interior overall is well designed and there's just enough room to work with, all the larger components will fit easily including even the longest graphics cards. You'll get 7 PCI expansion ports at your disposal.
You will spot two optical drive bays (5.25") to choose from, each features a latch that has an "open" and "lock" position. You simply pull and release the latch. Mounting a 5.25" device could not be any easier - just line up the holes on the optical drive you just inserted into the case and when you hear a click the pin locks have secured the device.
Small but subtle detail, all cabling is black as well. This will help you greatly with aesthetics of your build.
Here you can mount lengthy ATX power supplies. There's plenty of space for even the longest units. The Obsidian 450D has a removable dust filter in front of the intake fan and underneath the PSU in the bottom rear of the case.