So I'm thinking about putting the ASUS P9X79-E WS (http://bit.ly/19h7PVS) in the 900D, but PCPartsPicker says they're incompatible. After some googling it looks like it should fit but I just want to check. Getting a 900D and that nice of a motherboard and having them not fit would kind of suck.
I dont see why it wouldnt either, it supports upwards of e-atx and above which are all larger than the CEB format. Maybe contact corsair and see that there are standoff positons to work with that insane board you are looking at.