While we often receive requests to test one of Lian Li's enclosures, we frequently encounter difficulties in actually getting their products to our test lab. Luckily, this wasn't the case for their new "O" series of enclosures: we received the PC-O5S, a very special Mini-ITX case that has enough room to accommodate a 3-slot graphics card!

Announced by Lian Li back in October of 2014, the O-series of enclosures consists of four different models: two Mini-ITX cases, a micro-ATX enclosure, and an ATX tower. Features that these enclosures have in common are that they can be placed in both horizontal and vertical orientations, that they can be attached to the wall, and perhaps most importantly, that they'll enable you to make the most of the hardware that you put inside them.

Core design choices include the glass panel that covers one of the enclosures' sides, and the use of PCI-E risers that allow one to position the graphics card parallel to the motherboard rather than perpendicular to it, a construction that we've previously only seen SilverStone use for their RVZ01 and ML07. As a result, these cases aren't particularly compact, but are quite "thin". When placed flat on its side (as per the photo below), the PC-O5S that is covered in this article has a height of less than 15cm, substantially less than the 20-23cm of your average tower!