You would be able to simulate Eyefinity with SoftTH. However, I would not recommend this unless you already have 3 monitors. The 4000 series just doesn't support the hardware. Like i said, it can be simulated.
If you're going to be buying extra monitors, you may as well do it right and get the hardware that supports it.
I think what he's trying to get at is this, if you are not going to do it right (buying the extra monitors and a 5XXX series card) then don't even bother.
Yea more or less. What I'm seeing with SoftTH is a buggy outdated program that is a big downgrade from eyefinity to the point that its not worth doing if you have to invest in the software solution. Of course you could piece it together over time ie getting the monitors set up then a video card that has the hardware support. I foresee a big disappointment with anything other than eyefinity.