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Deleted member 11852
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Most if not all 3D games upscale great.
This is definitely not my experience. Both DuckStation and RetroArch - pretty much the most well-supported cross-platform emulator - are good for 2X internal upscale, everything else is done in post-process. DuckStation offers a 3X and above but I cannot get much to work without severe artefacts. If you stick to the 2X boost and texture filtering you're good but @orangpelupa is looking for a genuine 1080p/4K 3D render.
Emulators that actually emulate the PS1 at internally upscaled resolutions more than 2X and don't introduce a bunch of artefacts in a ton of games seemingly do not exist. The moment you're running Gran Turismo, Tomb Raider, Wiperout, Crash, Resident Evil, Metal Gear, Driver, FFVII, the visuals start falling apart. ¯\_(ツ)_/¯
I'm not running exotic hardware here, dual-3080s and an i9. Stock emulator installs and no amount of tweaking emulator/core settings as helped. Just googling "emulator upscaling ps1 games" gets a bunch of google and YouTube tutorial hits. it's a common enough ask to have a ton of hits but most tutorials just recommend 2X, texture filtering and post-process upscales. But N64 and Sega Saturn emulators upscale really well.