By play you mean full speed nice graphics full sound Nope.
If you mean run than you can.

 

Will it run FFX or Kingdom hearts with decent fps?

 

I think it will run the game's at 20/30Fps.
You can wait for the next release it will be faster and more stable whit dualcore.

 

Wouldn't that ZeroGs help?

 

Will it run FFX or Kingdom hearts with decent fps?

Since you have an AMD64X2, you should get some good speed at many place on ffx ,for kingdom hearts maybe.
Anyway ,use the search button the next time or/and go to the screenshots thread , that's why its made for

 

Wouldn't that ZeroGs help?

If you are talking about the new one Yup I think it work.
But you need to wait ~1week (if the bugs are resolved in time)<atleast thats what Zero said> to test it.

 

But isn't it the one included in the newest emulator package?

 

Yup thats the one.