In vista.x64 it wans't possible to strech your screen over 2 monitor's and for example play games at resolutions nobody held for possible 3360*1050 or if you could pivot your screens 2100*1400!!!
In Seven for now still the same !
My Rig (bought 2 years ago)
asus p5k mb
q6550 2.33 @ 2.81
Asus EAH3870 magic 512 mb
2*flatscreen both DVI @ 1280*1024 @ 75hz
Please tel me its possible