Where can you buy a 1GB HD4870?
From what I have seen, the 512MB HD4870 is doing pretty amazing at high res with fsaa. It more than competes against the GTX260 at 19x12 with 4xaa. And even at 25x16 res 4xaa (settings I'd have to think are pushing it for 512MB), it's trading blows with the 896MB GTX 260. I haven't seen it take a dive in any charts like we see 256MB cards do when they reach their limit. (8800GT for example