4k@60hz big interference problem

Hello.
I have a 2014 MP with the D700 upgrade.
I am using it to drive a 28" philips 4k monitor http://www.amazon.com/gp/product/B00K15LQZM
In single channel mode (30hz) it works beautifully. However, when i enable displayport 1.2 on the monitor, there is interference on the right side of the screen. it is a regular pattern of noise (always the same degradation), and does not seem affected by moving the cable around.
I bought the nicest miniDP->DP cable i could find which claims to be rated for 1.2, however after seeing the noise I decided to try another cable.
This time I tried a 1.2-rated miniDP cable and a 1.2-rated miniDP->DP dongle. With this cable, the interference is ridiculous. the screen will flicker off and on, and the noise which was previously on the right side of the screen is now on both sides of the screen.
Going back to the first cable restores the partially-degraded state, which is what i have to use when 30hz gives me a headache.
Based on another post here, I have a hunch that this is some kind of EM leakage--though disabling wifi did not have any effect whatsoever.
so my question is, are there any other radios which could be interfering?
I have moved to a different house, and to another floor and side of my current house while troubleshooting this, and the noise is identical--seemingly ruling out ambient EM noise. I can't find any more 1.2-rated miniDP->DP adapters to try. I'm open to just about any ideas. I thought about bringing it to the mac store where i bought it, but they don't have any 4k/60hz monitors there for me to try.
So far the $6k I've spent on this rig is under-performing the PC i bought for $400 5 years ago... hopefully someone can guide me to a solution or i'm basically done with apple lol

I found this post buried in another thread. looks like this is a very common problem with the D700's. It seems like this is not a defect with my unit but a known bug with OSX display drivers.
https://discussions.apple.com/thread/6080897?start=75&tstart=0
basically the only way to "fix" this is by hacking a custom display header file which tricks OSX into thinking the monitor's native refresh rate is 50-56hz instead of 60hz. I'll update after i've tried this.
too bad apple doesn't seem to care about quality issues... this bug has been open for a year and no one in support seems to have any clue how to mitigate, let alone fix it. Good thing for hackers.

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