Runs great on a 1950, so a 1900 can't be far behind. The demo for me runs very smooth if the demo is anything to go by. But you should check for sure via the demo.
Apparently there's an X-Fi crash problem according to the epic forums. And if your demo crashes, then your retail will also crash. If you disable the X-Fi then it should run fine hopefully, i don't know just going off on what i read.
It also reads on there that it doesn't like the 8800 gt(s), which is a bit silly since it's meant to be tweaked for nvidia cards. The suggestion for this was to tweak ** ini file in your documents, or try it in window mode.