How well did Radeon cards perform with PS1?

[Death2All]

I'll be purchasing the last few parts for my new computer in the next few weeks or so. While I'm primarily building it to be able to play new games I'd still like to be able to reliably play PS1 when(if?) it goes F2P.

I've always heard small bits about how Radeon cards performed poorly with PS1 for whatever reason. I had always played PS1 with Nvidia and I was more than likely going to pick up a Radeon 7870 with this new build.

Also, I know that most newer tech performs poorly with PS1 since it doesn't support most of the new features.

I know this is more of a tech related question and probably belongs in the tech support forum, but I feel like it will get more attention here. Thanks and hopefully see you in PS1 in a little while.