yeah i wouldnt try them unless u had any special problem with ur current sets as they are optimized for QUAD SLI ....
but incase ur thinking about it here is a comment from maker over at guru3d
edited by makler : Yesterday at 09:51.
3dmark05 (@495/980) :
fw91.33 - 4782
fw91.37 - 4771
3dmark06 (@495/980)
fw91.33 - 2511
fw91.37 - 2501
score are about the same, gonna do some game tests now..
p.s. I haven't noticed any bugs so far, w00t!
EDIT : NFS MW and Oblivion is running better then even (a lot smoother and with less shuttering), but I've con an error in mscrt71.dll while trying to load a level in Titan Quest
EDIT2 : Prey and HL2 - Episode One runs fine
http://forums.guru3d.com/showthread.php?t=190583&page=1