Are you sure your "killer rig" will be able to cope with FS9 and FSX?
Pardon the sarcasm, but it beats me why one would need a 'killer rig" to run 'dinousaur software" ;)
I remember you. You belonged to the FS98 Bob Fiedler gang, correct?
BTW, this must have been your last post, 11 years ago
https://www.flightsim.com/vbfs/showthread.php?63939-Running-mulitple-displays