Just my single 5870 has been able to handle just about every game I throw at it with high settings so I am pretty happy with the eyefinity solution.
Dual cards is a big investment, it means 2x power consumption, 2x heat, 2x cost, need a motherboard that supports SLI, and a computer case that holds it all well.
I was very happy to "downgrade" my dual 4850 setup to a single 5870.
I think to this day Crysis and Metro 2033 are about the only 2 games that I felt my system needed to be stronger to play in surround and both games are known to be rather poorly optimized for PC.
Id definitely go 1 card over 2 given the choice any day.
The things I would look at is what flaws eyefinity has and if Nvidia Surround fixes any of those.
In my case "the line" issue is one major flaw in eyefinity, I still have it to this day and I am not sure if its a hardware or software issue but its there. I also still dont like a few minor issues with the drivers AMD is using like not saving my aspect scaling options when I use a profile to change between a single monitor and eyefinity mode.
If Nvidia has those issues fixed thats a good +1 for Nvidia, but also make sure they do not have any major issues that off set those advantages.
Im sticking with the 5870 until a new single powerful card with 2gb vram is released from AMD, then I play to upgrade to an i7 and stuff along with it (2600k looking pretty nice)
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