I have a three monitor setup -- The main display's connected to a 390, and the other two are connected to a GT620.
The first problem is custom resolutions not working as I mentioned in the OP.
My second problem occurs when I change my main display's refresh rate to 75Hz. The two extended displays are at 60 -- when I change the main display to 75Hz my 390's memory clock becomes stuck at 1500MHz. I was under the impression that using a different GPU for extended displays would fix the memory clock issue.
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Many of us users are not familiar with mixed multi gpu usage, hence my referral to Matt/Ray.
Why did you forget to mention this in all (that I have read/replied to) of your other posts ?
I forgot to mention not having a second GPU in all of my other posts because I didn't have a second GPU installed at the time I created all of the other posts.
The Dell2414H is connected to a R9 390. The Dell2007WFP is connected to a GT 520.
Here's what happens when the Dell2414H is set to 60Hz. You can see memory clocks fluctuating like normal.
60Hz and 75Hz http://i.imgur.com/YU2ehz3.jpg
60Hz and 60Hz http://i.imgur.com/nfIYwMh.jpg
Here's what happens when the Dell2414H is set to 75Hz. You can see memory clocks have become stuck.
75Hz and 60Hz http://i.imgur.com/QGHVqkC.jpg
75Hz and 75Hz http://i.imgur.com/gk62G4R.jpg