Can I still play ps1 and ps2 games on my playstation 3 if I upgrade to an HDMI cable?

May be...

will it look better?

A little bit. If you're upgrading from 480i to HD resolution it will look much better, especially for ps2 games that have progressive scan.



But if you are already using component video cables, it will look a little bit better than component.



The ps3 upconverts and smooths ps1 and ps2 games to HD resolutions, just like it does with dvd video. But ps2 in native progressive scan looks best of all. Try God of War in progressive, it looks like a ps3 game.

yes, but not all ps3 s play ps1 and ps2 games only the old ps3 s....

yes they will still play and they may look sharper depends if on 1080p.