It's just a recommended spec based on the machines they are using to test the alpha/beta builds of the game. Viks once said the minimum spec for RoF is "a PC running windows"

Hiccup, Buddy..I'd be suprised if your systems didn't give you positive results.
I have a similar system, once it was high end. w/c'd c2d @3.6 with 4 gig of ram and a 8800GTX. I've swapped the 8800 for an Ati 4870, but me and my PC are slipping down into mid range very quickly *sigh
It maybe that we have to dial some of the gfx options down a tab, but you'd expect that in a new game. There has to be some future proofing in the engine. Think IL2, my latest PC is only now able to run it at full tilt after all these years. Hopefully RoF will give us that longevity