Aven Donn
Saruwatari Kooji
Aven Donn
I thought ATX (And its variants such as mATX) was the only standard still alive today... What's BTX?
BTX was a motherboard standard developed by Intel(I think...) a few years ago. The theory was improving airflow by rearranging a few things, but it wasn't much of a gain and it never really took off.
I thought the whole "Motherboard arrangement increases airflow" thing was solidly debunked, considering how no serious case comes with the specified ATX reverse S shaped airflow and the whole PSU as exhaust fan...
It's not that it doesn't work (it absolutely can help, and is why alienware (and a few other high-end boutique manufacturers) don't use standard board layouts), but most manufacturers will build for the most commonly used hardware, which makes it more commonly used, and the cycle continues.
So, if someone was to jump to a new standard they'd have to convince case manufacturers to jump as well, and they're not going to do the necessary changes to accommodate that if they're only going to sell a small number of cases (and certainly not enough to cover the changes).