Quote Originally Posted by Magixion View Post
Only some versions of them are. I know the 40GB versions are not backwards compatible, as well as the new 80GB bundle they are putting out. Other than those two, I believe the others are backwards compatible though.
40GB is compatible with PSX games, but not PS2.

The older 80GB model is compatible with PSX games and some PS2 through software emulation, while the newer ones released this month don't have PS2 compatability.

The 20GB and 60GB models offer full backwards compatability with both systems, though wikipedia informs me that the PAL 60GB model had software emulation and the 20GB model was never released there so if you live in Europe you won't get full PS2 compatability no matter what.

Honestly, if you have a PS2 and want a PS3 you could just keep your PS2. It's not worth enough to sell second hand anyway. Either that or try to track down a used 60GB model.