According to your manual, it should work with 2x, 3x and 5x since it supports these resolutions
It doesn’t support interlaced signal, so take note of that too.
It just means when you play PS1 games that are in 480i, you’ll need to use bob deinterlacing where the screen will shake up and down similar to a CRT TV is all. Passthrough won’t work on those interlaced signals. 240p however should be fine.