I was using and HD6670 to run three monitors, and it really wasn't doing the job I needed it to do, so I went and invested in an HD7790 to replace it.
My question now, is should I just run all three monitors off of the HD7790, or just the main, 27" monitor, and the two "side" monitors, 22", off of the 6670? Would I get better performance in full screen games if it isn't also feeding the side monitors?
Also, my 6670 doesn't have dual DVI outputs, just one, with a DSUB and an HDMI. Eyefinity won't work with all three monitors due to the DSUB, so, if I use an HDMI > DVI cable, will windows recognize the second monitor as digital rather than analog?
The other question, is there a way to test it to see which setup is better? I'm using both cards now, and Windows is perfectly happy, but what is the best way to find out which setup is better?