I disagree.
And really who cares about Macs?
They are ******************
Fact is people who are wise and ditched their 5870's are in a good place with a 6950/6970 under the hood
Coming from a 5870 to the new 69** cards isnt worth it, perhaps if the 69** series get voltage unlock etc you will see a large difference.
I bought a 6950 at £200 and upgraded from a 5850 (PCS version)...its loud and hot, but its a reference card that i will be able to watercool as soon as the blocks come out.
I couldn't run this card with stock cooler its driving me mad and that to me is a disappointment, dont get me wrong its an improvement and worth the £80 extra i had to payout when i sold my old card but im regretting not biting the bullet and getting a gtx570.