Here are the best. BTX — short for Balanced Technology eXtended — was a form factor that was coined to replace the ATX motherboard form factor in late 2004 and early 2005. Intel came up with ...
BTX: 12.8" x 10.5" -- Released in 2004 by Intel ... Ultra ATX: 14.4" × 9.6" -- Developed by Foxconn and first shown on its F1 motherboard prototype at CES 2008, this form factor is essentially ...