That is what I am trying to figure out. Since they have the same core it all comes down to how important the GDDR5 is. This is something that has to be investigated.
My opinion is no, the 4850 is around $120+ cheaper than the 4870.
that's what i'm thinking too . i just wanna be able to max out tf2, ut3, with 70+fps
With pretty fast ram on the 4850 i dont think gddr5-gddr3=120$