my sandy bridge i3 is performing pretty poorly in this game, like low 20s while driving trough some areas, even with LOD on medium, you need a sandy bridge i5 or similar (overclocked 8 core FX) to run the game well I think, but the Passmark recommendation is useless for sure.
techspot reviews is not very good, they didn't choose the test scene very well and are using older drivers,
other sites are doing a better job,
but while the game can look great at times (I was driving around at night with some rain, really great), as the GTA 4 vs it youtube video shows, its not as good as GTA 4 in some areas, driving, the car physics is far less enjoyable, damage is pretty poor, the car is like a tank...