Looks about right to me. A HD7950 scores about 1000, and a GTX680 scores about 1300ish.
See for example: http://forums.eteknix.com/threads/unigine-heaven-4-0-benchmark-results-leader-board.9127/
For the record my i5 760 @3.4 GHz with DDR 1600 and HD7950 @1000/1350 just now scored 1089 (but I was chatting at the same time, so might be a bit higher)