Try SLI??
...my GTX570 still kicking butt, I'll wait for gtx700 series to upgrade.

No it won't.

Me too, but CD seemed pretty adamant that it wouldn't happen (at least not anytime soon..)

I beleave the 4870 was a estimate benchmark for high end systems even thoe 4870 is DX10 witch where great cards.
The game will utilize most recent hardware trust me.

I read the Tomb Raider blog apparently they have some sort of AMD relationship? I donno, something like that. They probably optimized it such that it works well on older AMD cards, which is good news for people with older cards. And yes, it will look fantastic on newer cards. Excited for the game.