jimthenagual :
Yes, the HAF X supports E-ATX motherboards.
Yep, same as the HAF 932, EATX will fit just fine. Mine has an ASUS P9X79 WS.
Does the HAF-X have a fan at the top? If so, think carefully about where to put the
PSU. I built a 932 unit for someone with the PSU at the bottom, only realised later
that with the PSU at the top it would mean there'd be space for 4 GPUs instead of 3,
so when constructing an identical system for myself that's what I did:
http://www.sgidepot.co.uk/misc/vpc01.jpg
It means the cooling setup has to be somewhat different, but worth it to support
the extra GPU option.
Ian.