Perhaps surprisingly, E: D isn't actually that hard a computer. My system is over four years old and wasn't top of the line when I built it (though certainly above average), at a price of about £600 back then. And it runs E: D fine at medium settings. And by fine I mean I have yet to notice
any frame rate issues whatsoever, even in fairly congested systems. And the game still looks gorgeous, too.
But then, maybe not so surprisingly. After all, to
quote David Braben himself, space "is easier to render"
To give you something to measure against, that is with a GeForce GTX 470 with 1280mb of video ram. So I would not be surprised if, at low settings, the listed minimum requirement of 1GB and either a GTX 260 or a 4870HD are, for a change, actually perfectly playable.
[Edit] And for the record, I totally got hooked on FE2 from the second I started up a commander for the first time in Ross 154. That starting view from Sirocco Station on Merlin, with the geodesic domes of the colony and the gas giant Aster hanging just above the horizon sporting a splendid set of rings... yeah, even if I hadn't loved the game for all its other qualities, that view alone would have earned it a week or two of my time

As it was, it instead got years and years, got bought a second time after I wore out the first set of floppies, and STILL gets played from time to time on an amiga emulator.