Max 3200x1800 resolution on 4k monitor??

I got my Asus PB287Q 4k monitor yesterday and started using it with my Mac Pro (Late 2013). A few issues arise:
If used alone, I get a max resolution of 3200x1800 @ 30Hz.
If I switch to DP1.2 in the monitor preferences, I get max 3840x2160 @ 60Hz, but then I get artefacts on the right hand side of the screen (apparently this is an Apple problem and is going to be resolved in 10.10), but effectively is useless
The only way to get max resolution of 3840x2160 @ 30Hz is to plug in an additional Full HD monitor via HDMI (I am not joking!)
There is no startup screen on the Asus (not really bothered by this)
What I would like to do is use the screen at max resolution simply on its own. 30Hz is absolutely fine for what I am currently doing.
I appreciate your help.
LL

Good thought. I tested it with the three different buses, same result.
Funny enough, just looked at my 'About This Mac':
It shows the Aus as having 6400x3600 resolution, which is not correct.
Here is the screenshot of my Display Prefs:
Both displays are driven from a D700 in slot 2:
Also, when the screen comes back online (after sleeping, etc.) I might have the 3200x1800 resolution back up. I am using a DP 1.2 cable sourced from Amazon.com.

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Max 3200x1800 resolution on 4k monitor??

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