IT Mode is a pass-trhough mode, basically passes the drives straight through the controller to the OS. You don't have to configure drives and arrays in the cards BIOS anymore. That is the way most people use these old Raid cards.
IR is probably the normal Raid mode that you currently use it...
I played it and enjoyed it, but the version I had glitched at the end so never actually finished the game.
I'll probably get this one if it's priced reasonably.
I had one of those back in the day, mine had a door covering all of the 5-1/4 slots.
It's under the desk on the far right, goes from the floor right up the desk, almost didn't fit.
Probably because we know we need NIC's that support it and don't have to keep mentioning it.
Btw, if you don't have an internal slot for a 2.5GbE Nic, these work just fine, I've used this on many PC's and my SteamDeck to get faster transfers on my network.
I had a Corsair Air 540 and was able to mount the fans on the front of the case and the front panel had enough clearance for the fans.
would that be possible with your case?
Cat5e easily handles 2.5GbE. I have a 150'+ run that was installed 24 years ago. Modem/Router and secondary PC are upstairs and my main PC is at the end of the run and I get full speed from my secondary PC to my main pc and plex server.
The 5900XT is coming out soon, it's basically a 4.8Ghz 5950X. With the 5950X selling new for $360, this new one might be a good value new, or maybe drop used 5950X's prices more.