Thanks guys .... I am happy with crossfire the only thing I want to fix is the odd bit of screen tearing so ill be picking up at some point 3 x FREESYNC monitors.
I will need help with this as I don't want to buy monitors that undo the card performance so are 3 1440 FREESYNC monitors realistic with these two cards ??
Yes, as long as you don't want witcher 3 at ultra at 60 fps, it's totally realistic. This is an enthusiast forum so people here will shoot me down for this, saying you NEED like 15 980Ti's just to play at 1280 x 1024.
But if you are willing to turn down a couple of settings, you should be ok for 60 fps in most titles with those 2 cards. It's only really things like GTAV, TW3, Project cars *shudders*, Metro Last Light, Crysis 3 that you won't be able to max out. In that case, just turn AA down as low as you can stomach (for me at 4k, thats actually off entirely, but on 1440p monitors I would go 2x), and some effects such as ambient occlusion can be turned down without much visual impact at all due to the high resolution (just because of the way those effects work). Everything else should be grand.
Crossfire scaling with XDMA is incredibly good, better than SLI for sure, but its still multi-GPU. If you are ok with than then ok, but otherwise...
You may want to consider a 980Ti. It will perform better in games that don't scale well, but won't perform as well in games that do. Around a similar price too, and its a single card.
OR, A single air cooled fury. That won't perform as well as a 980ti or 2 390s. But its quite a bit cheaper than both, and in high resolutions the Fury (and fury x) are very similar to the 980Ti in performance. Might be worth grabbing one, seeing if its enough, if not, get another. See here
http://www.anandtech.com/show/9421/the-amd-radeon-r9-fury-review-feat-sapphire-asus/8
Not sure how the 4GB would handle 3x2560x1440 though... At 4k its fine in my experience, and thats 4GB of GDDR5 so... idk.
P.S. if you read the review above completely ignore the ASUS STRIX DUCIII Fury (or the DUCIII 390X). The DUCIII cooler is just as bad (if not worse) than the old DUCII cooler on AMD cards, a completely terrible design made to look flashy but performs like arse. 2 of the heatpipes don't even touch again! (Spoiler as huge image)