Are you able to say whether, during internal testing, the extra memory makes a substantial difference @ eyefinity resolutions? I'm not planning on running more than 3 monitors so all the displayports isn't really a selling point for me. So, I suppose my real question is...is it worth it to wait another 2 weeks/month?
We've shown in some of our other internal testing that more VRAM helps at higher resolutions and higher AA settings. I can say that the higher VRAM is helping in some situations on a three monitor setup. However, I can't say any more than that for risk of breaking my NDA.
So far I have tested:
Radeon 5870 1GB
5870 Eyefinity6 2GB
5870 Eyefinity6 2GB CFX (essentially the same as the upcoming 5970 4GB cards)
The one thing I haven't tested is the existing 5970 (2 GPUs each with 1GB VRAM). I have confirmation from ATI that a 5970 will be arriving tomorrow. By the time the reviews can come out, I expect to have a solid Buyer's Guide ready for the Enthusiast (single 5870 and higher) segment. My goal is to help you get the card you need - not more, and not less. And to make sure you're not wasting money on overkill.
So far I have tested: Batman:AA, Battle Forge (DX11), Dirt 2 (DX11), Far Cry 2 (DX10), GTA IV, HAWX (DX10), Heaven (DX 9, 10 & 11), HL2, and STALKER Pripyat (DX11). I've tested at 1680x1050, 1920x1200, 3x1680x1050, and 3x1920x1200.
I plan on testing 3x1200x1920 (portrait mode), and 3x1920x1080 (to compare 16:10 to 16:9), and then 6x1920x1080. Hopefully it will be worth your wait.