If you install a PS2 keyboard all that hidden information comes up in the BIOS and gives you the option to power on by keyboard.
Also, having the PS2 keyboard is faster to respond on boot compared to USB, especially when hitting the key to get into BIOS. USB devices take a few seconds to kick on.
I assume the real reason the PS2 connection is on a gaming motherboard in 2020 is because pro gamers prefer it. It will always work, when you boot a PS2 it lodes even before the BIOS does. Newer stuff is not always better.
Truth!
PS2 keyboards have not been made for a long time but adapters are readily available.
Not Truth! LOL... Because of the popularity you refer to above, adapterless PS2 keyboards are readily available. I got one of the old school, loud clacker PS2 gaming keyboards from Microcenter.
As far as the 6 USB ports on the back of my machine, a lot of them are for flight sim stuff:
- Mouse
- UPS Backup
- Gaming Headphones/Mic
- Flight Stick
- Track IR - Infrared Receiver (Head Movement Tracking System)
- Track IR - Headset Transmitter