So I've been seeing people discussing about using ps/2 instead of usb and I decided to investigate this myself.
Upon testing with usb my results were 8ms of delay at a scan rate of 125hz.
Plugging into ps/2 via a usb converter has given me 16ms of delay at a scan rate of 62.5hz.
I don't have a native ps/2 keyboard to test with but I'm going to be sticking with using usb. I also measured the input delay through osu! using a high speed camera and have seen that it is also reporting roughly 8ms of input delay. The setup I used for that was binding k1 to num lock and recording the led turning on with k1 in game lighting up on the key overlay. I'm currently using windows 10 and I believe that usb overclocking is not compatible, so I haven't bothered to check and test that.
This whole thing is honestly whatever and you can take it however you'd like.
Edit: cleaned up some stuff (x2)
Upon testing with usb my results were 8ms of delay at a scan rate of 125hz.
Plugging into ps/2 via a usb converter has given me 16ms of delay at a scan rate of 62.5hz.
I don't have a native ps/2 keyboard to test with but I'm going to be sticking with using usb. I also measured the input delay through osu! using a high speed camera and have seen that it is also reporting roughly 8ms of input delay. The setup I used for that was binding k1 to num lock and recording the led turning on with k1 in game lighting up on the key overlay. I'm currently using windows 10 and I believe that usb overclocking is not compatible, so I haven't bothered to check and test that.
This whole thing is honestly whatever and you can take it however you'd like.
Edit: cleaned up some stuff (x2)