Hi,
Im just guessing here as you did not provide any information on your OS and hardware.
Audio DPC latency could be caused by a number of issues with your system besides your capture card. It's important to check your system for corruption,
outdated/bugged drivers, missing windows updates, unpark your cpu cores, setting Power Options in control panel to High Performance and a proper config for OBS
with nvidia nvenc encoder.
Open CMD as Admin and run these commands one at a time and wait for each to finish before executing the next:
Dism /Online /Cleanup-Image /Scanhealth
Dism /Online /Cleanup-Image /RestoreHealth
sfc /scannow
Reboot pc and run windows update, install all missing updates including updates found in Settings > Windows update > Advanced options > Optional updates (these will be missing or
updated drivers for your system).
Hold the windows key on your keyboard down and press the letter R to bring up the run box and type control. Open Power Options > Change Power plan to High Performance and Change
advanced power settings: Disable USB selective suspend setting, PCI express Link State OFF and Multi media setting: Prevent idling to sleep, video playback performance and optimize video quality.
Save changes.
Download CPU unpark and check if your cpu cores are parked:
https://coderbag.com/programming-c/disable-cpu-core-parking-utilityRun as admin, check power plan is set to High Performance and under Core parking index move the slider to 100%, Unpark All and Apply.
Follow this guide for OBS/nvidia
https://www.own3d.tv/en/blog/obs-studio/most-important-obs-settings/One issue this guide is missing is to cap your FPS while gaming/streaming or you will have desync/latency issues.