From the auction page:
The revision 3.0 aparently does not have the problem of some of the caps installed in backward causing premature failure that the rev3.1 has.
I'm not sure if the caps are oriented correctly with 3.0 cards (probably not), however 3.1 revision is definitely more desirable to have than 3.0, due to 3.0 being a lot more buggy. I don't think it can work with A3000 units, without modification.
