Normally-sized desktop cases don't have any problem fitting things, but vertical space becomes as big an issue as horizontal room when the form factor gets smaller.
tried to solve the interior problem by giving the PC-V650, a new mini tower, a square shape and a side-mounted PSU compartment.
It also made it possible to remove the bottom 3.5-inch HDD bay (out of seven), so that expansion cards (video boards, LAN cards, sound adapters, etc.) may measure up to 14.5 inches in length (368 mm).
Speaking of which, the chassis has one 5.25-inch ODD bay, four 2.5-inch SSD drive trays, thee removable 140mm fans (two behind the front panel, one at the top) and one 120mm spinner (at the back).
The full specs of the miniature enclosure (494 x 428 x 305 mm / 9 x 9 x 14.1 inches) can be found here
. The price is $199 / 160 Euro, regardless of color (black or silver).