I looked up scores and some other guy got 3703 with basically the same system I have (1x680, Windows 8 64-bit, i5-3570K) so I've no idea how reliably these scores are. Another guy got 2383 with a 1xGTX570 and 2500K rig. Other benchmarks seem to scale properly.
The issue isn't the score. The score is likely correct. The reading of the clock rate is all that is incorrect. Unigine gets your score based on how many frames were delivered, not by your clock speed. That is a new feature, clearly something they need to work on. It is not your score, btw.