BUILDING THE SYSTEM
The sole purpose of this section has always been not to produce a working system but to showcase what you can all expect in terms of interior space from the case at hand. However since the Obsidian 900D will be housing our primary test rig pretty soon we will update this review with a picture of our finished project when it's completed.
I've never seen a PC case capable of holding two ATX mainboards and although the Obsidian 900D can't either it comes pretty close.
No matter how large of a CPU Cooler you use there will be plenty of free space around.
When it comes to graphics cards the sky is the limit since you can fit even the longest ones available without issue.
The PSU area was designed in such a way that you can also place a radiator even on the same side as the PSU. This as you can see is not hard if you use a normal sized model but if you opt for one of the really long ones (as i think it's natural for people with mGPU configurations) then your best choice will be to mount the radiator on the opposite side.
This picture taken directly from Corsair showcases the interior space of the 900D in all its might so until our project is complete we thought we'd post this instead.