4n7_MK2: what worked here is : i used DX12 with low settings.. crash at loading.
So used DX11 EXE & at launch it resetted GFX settings to default. Now it works fine. So try this or delete your GFX settings file to make a new... (maybe V4 needs a fresh settings file, or DX11... do tests..)
PS: on my ROG ALLY i got 7GB for video then so only 9GB left for system + game, so it's not RAM pb even error text say it... i believe you must try that. and not tested on desktop PC, i think it works fine on it.
Using DX11 doesn't fix anything. Wouldn't wanna run DX12 on Ally anyway, but it's where all the new Patch 4 new grahic features are and i have PC fully capable to run it. I also changed my rig completely since then and the situation hasn't changed. For two years now there are new graphic features, but the game is still barely playable with them and CDPR is unfortunatelly doing squat shit, to fix it.