The Carbide 300R is simple in looks, with all black construction.
At the top is the front I/O panel. Left to Right: Power, Hard drive activity LED, reset, Audio ports, and USB3 ports.
Though the front panel is made of plastic Corsair gave it some flair with faux socket head screws.
The lower front is mostly metal mesh for the front intake.
To the side of the front panel is more venting.
The top of the 300R is mostly mesh. It is setup to accept either twin 120mm or 140mm fans.
The left side panel has two mounting points for 120mm fans.
Moving round to the back of the 300R: the 120mm fan is pretty close to the I/O shield area.
The edge of the fan body is right on the edge on I/O shield cutout. Under the fan are knock outs for water cooling pass through holes, no grommets included.
The 300R has 7 expansion slots, each of the slot covers is vented. The area to the side of the expansion slots is vented as well.
The power supply area features a removable dust filter. The filter slides out from the rear of the case.
The 300R has case feet styled like those on the 800D, but are plastic rather than metal. In each corner of the feet is a small rubber pad.