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Pros: Now, 60Hz works in Portrait mode, 2160 x 3840.
Now, power·cycling the monitor causes no problems.
I updated my graphics driver
( Intel Core i7-4790s, Intel HD Graphics 4600 )
using the "Device Manager", Windows 8.
Latest update: March 3rd, 2015 ( this year ).
The "DisplayPort v1.2" cable that came with the monitor
was broken; so I bought a new, much better one.
Cons: No Cons.
Other Thoughts: IPS colors rock!READ FULL REVIEW
Pros: 2160 x 3840 pixels, 60 Hz, IPS, DisplayPort 1.2 .
Cons: Dell sent me a bad DIsplayPort cable.
I didn't realize this until now, 9 months later.
Other Thoughts: I'd delete my previous reviews, if I could.
Dell sent me a bad cable, that's all.
Replace the DisplayPort Cable -- REPLACE IT ! ! !
I was having serious problems until, one day,
I decided to replace the cable.
Be sure it's 4K, 60 Hz rated... with thick, good shielding.
Do NOT buy a lower-rated cable.
Oh, My, Ｇod... did that make a difference ? ! ＯＭＧ.
Before, I had numerous failures,
including garbage on the screen;
the monitor would occasionally force low-res, low Hz, etc.
The original cable had bent pins and the like... really bad.
Why did Dell give me such a Ｃrappy cable ? ?
Dell's cable is half the width of the $9 one
that I bought to replace it ( same day shipping, from/to Seattle ).
Pros: It's IPS, so colors "remain true" ( i.e. they don't shift ),
no matter their screen location .
When you're 12 to 18 inches from the screen,
as I am, the high resolution is much appreciated.
It swivels portrait, so you can view -much- more text
when editing and/or browsing...
and there's more than enough room to watch
a 1080p video at the botton of the screen too.
Cons: When swivelled portrait, as mine is, it's 29 Hz only;
i.e. videos are limited to a jittery 29 fps,
no matter how good your video card may be
( $430, Quadro K2000, or $160 Quadro K600 ).
When a video pans a scene, it looks -bad-, jittery.
To get the portrait mode option, you must
set the monitor to DisplayPort 1 ( not 1.2 ).
Obviously, this is -bleeding- edge tech,
not quite ready for prime time.
Other Thoughts: I can't wait until better/cheaper 4K/UHD,
185 dpi, IPS monitors, with 120 Hz/fps,
portait mode, appear.
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