Originally Posted by sepheroth003
I love the idea of 120hz and will soon move to one, but not for 3d. I'll do it for reduced tearing. Are you planning on playing in 3d? This isn't something I have a terrible amount of knowledge on but it seems Nvidia is ahead of AMD for 3d games. AMD went with open source 3D technology that doesn't seem to be widely adapted yet.
As most have said, 7870+ would probably do fine. I rarely feel the need to upgrade and a 7870 outperforms my 6970.
I havnt found a game that doesnt work in 3D on my AMD card. Just the ones that dont have native support built in require you to run tridef in the back ground to take care of the conversions.
A single 7870 wont be enough unless you can stand playing games in 20-30fps.
Passive 3D means it is done by the screen with a interleaved picture and you wear glasses like in movie theaters. Active 3D is done by the glasses which are normally large battery powered ones (this requires 120hz/fps to work correctly or you get flickering. Passive 3D doesnt have a hz/fps requirement but takes a huge performance hit on your gfx card since its doing 3 times the work for 1 frame so you need a high end setup.
At the bear minimum you need to crossfire 7850/7870 or a single 7950. But it will be much more enjoyable with a 7950/7970 crossfire setup or even a single 7970 over lower end cards.