Vantage skews results between systems like there is no tomorrow. It is hard to compare systems as the REAL WORLD results are always different in games. It is handy if you are upgrading one component in your system, or comparing identical systems with one or two different parts, such as in Hardware reviews.
Your first like says you are using an email@example.com GHz (wasn't sure if that was correct as your member config says i7 920). The next link is an e8400@3GHz. These scores are similar, which is probably pretty correct. However, the last link uses an firstname.lastname@example.org GHz and DOES have (2) 5770's. Notice under "Linked Display Adapters" it says YES. That is the tell of a Multi-GPU setup.