Not really into Xfire, since it's limited to a 5870 or 5850, I'd need another XXX Ed card, and they had been very pricy, plus since there was alot of issues back then and for these EOL cards, drivers kinda stopped helping some time ago.
Just use the 1 monitor[60Hz}, or the Vizio[75Hz}. With all the TS spec's,, 2012 and 2013 mainly it's not for when you want to use all the eye candy, that's where it get's little dicey.
When were in the big storm and on twin tracks, if using any AA [which makes a great IQ} that's just one reference to it stuttering. TS2012 in a world edited like adding a couple locomotives can do same even without AA, so it's hit and miss. It's like every few seconds maybe when frame buffer swaps IDK..............
The reboot thing not really a game changer, just haven't been able to try it on the Vizio lately to rule out the 216BW.