Question 1

Will this monitor work with my NVIDA GeForce GTX 550 Ti card?

Accepted Answer

No, you need a video card with DisplayPort 1.2 MST and a maximum resolution greater than or equal to 3840x2160

Question 2

Are these monitors revised model "AO1" or are they the original ones with MST problems which need to be shipped to Dell to resolve?

Accepted Answer

I do not believe they are shipping the modified monitors yet and you cannot upgrade the firmware yourself (you have to return the monitor to dell), I would wait for the updated monitors - there is a reason newegg has them discounted so much.

Unfortunately i cannot send you the link but if you search for: 'UP3214Q/UP2414Q - 1/2 screen issue and/or No picture after powering off, then on' 
on dells support forum you will find the latest info near the end - 
that's the only place with the latest info.

Just a note: You can make the monitor work as is (if you have the right hardware and drivers) - but its very very painful to use on a daily basis.

Questions & Answers