Well it does seem rather low. Look at this thread:http://www.tomshardware.com/forum/268505-33-win7x64-4890
Guy has his Core i7 clocked higher and his GPU is a tad higher but it does seem to get a much better score overall.
BTW, Which drivers are you using? As well, have you made sure that CrossFire is enabled in the CCC?
Make sure you have the 9.7 and have CF enabled.