Downhunter :
Thanks for the information.
I own a pair of ASTRO A40's so I connect them to my PS4 for audio.
But what if I wanted to connect a sound bar or speakers? Most likely I won't but just incase. Better to know.
And response times:
I'll mostly be playing FPS shooters. With a 5ms response time would that be a noticeable disadvantage? I know you said its minor but how minor?
AUDIO:
Aside from your headphones, I did find out there is a 3.5mm headphone jack on the back so you could connect that to desktop stereo SPEAKERS and the audio would work with both the PC and the PS4 PRO when you switch the screen from DP to HDMI.
SHOOTERS and 5ms ?
You may be CONFUSING two different issues. RESPONSE TIME affects the on-screen experience so may add a small amount of blur in some situations (minor).
INPUT LAG is what would be more applicable to shooters and that's the time from when a new frame is presented to the monitor to when the screen updates. It's probably a non-issue with these monitors (but is for most HDTV's).
OTHER:
If your PC has a Freesync-capable gaming AMD card (i.e. R7-260X or newer) then you may want to do two things:
1) cap to 55FPS so it stays in Freesync range instead of hitting 60FPS and reverting to VSYNC ON (lag) or VSYNC OFF (screen tear)
Can be done globally, or per-game (not sure how to do per game but likely can with some tool like RadeonPro). Also..
2) tweak settings so drops BELOW Freesync range is also minimized. Range appears to be ONLY 48Hz to 60Hz... at the very least if you have a choice choose to default to VSYNC OFF (screen tear but not added stutter).
Hope this isn't too confusing.
3) SHOOTERS - it may be ideal to run those games VSYNC OFF and keep well above 100FPS. You will reduce the total input lag (no VSYNC buffer) and screen tear can be minimal depending on the FPS.
AMD's newer drivers support the same feature as NVidia's FAST SYNC so if you can get over 120FPS on a 60Hz monitor it will only draw the last FULLY COMPLETED frame (and discard the other) so the screen is essentially 60x per second (no screen tear like VSYNC ON) however input lag is less than normal VSYNC so it's slightly more responsive.
sorry to confuse but it's complicated.