I'm also on an i5-8600 processor. I updated my BIOS and Realtek chipset drivers and that didn't improve my issue at all sadly. Video card = Gtx 1060.
With my overlay up in Minrathous and DLSS frame gen on I still get 50 fps or so on medium settings and the game looks/runs fine. It's just the audio that is messing up.
I actually get no audio distortion (or very very little) in the Crossroads, but in Treviso/Arlathan Forest/Minrathous it's unbearable.
So there's obviously some sort of performance issue going on here, but I'm still pulling a fine FPS and the game looks/runs without any video stutter. It's purely audio being affected. And even putting every setting on low doesn't fix it.
Also the Steamdeck runs this without any audio issues whatsoever and I'm fairly confident that the Steamdeck is less powerful than my pc. But Steamdeck gets such a low fps and graphics settings that it's kinda unbearable to play on that lol.
Moneys a little tight for me right now so I don't particularly want to shell out $1k for a new pc, especially when my pc runs other modern games (like BG3) without issue. So I hope Bioware finds some way to fix this.