The AMD FirePro V4900 has 1 DVI Dual Link and 2 DP connectors. If connected to 3 monitors, would all display similar resolution, ie 2560x1440?
each port supports the max resolution of 2560x1600(16:10).... Your screens are 2560x1440(16:9) well within the range... as long as you connect via DP or DL-DVI you will get the desired resolution... That which is native to the monitors ...
I'm a bit wary about this mix and match business, simply because I am not familiar with the potential result. A little over 2 years ago I brought a new computer home, hooked up 2 monitors and had an eye opening moment; the DVI which I was not familiar with had vastly superior resolution to the VGA. One gets used to it, but it is still irritating to look back and forth to the different resolutions. I resolved that any future rig would have a standard best resolution.
it has to do with bandwidth and refresh rates... The reason for the lower res on dvi is because of the bw with that media, in dual mode it doubles the bw which enables it to get to the higher res... It is all about the bits baby! Relax, this isn't complicated. Since you won't be able to use native DP cables, the signal will be going via DVID so it will all look the same.
I don't know specifically about the V4900, it's new. However... usually when there are "3-ports of 2 different types", that's to accommodate only 2 monitors... using the ports however fits. When the card design expects the user to run 4-monitors, all 4 ports are usually the same... 4, DP, or 2, DMS-59, or that quad-port thing the NVS 420 has. If I were you, I'd check further into trying to run 3 monitors from the V4900 and see if there aren't conditions/limitations, if possible at all.
technology changes at a fast rate, it is kind of like the markets... constant change... so understanding and keeping up with tech is key to making sure I am marketable (aka employable)... concepts have to change, new ideas have to be adopted, etc... or else, one dies like the dino...
This is from the specs sheet for the 27" monitor. Note it just says DVI cable. CONNECTIVITY 1 Dual Link Digital Visual Interface connectors (DVI-D) with HDCP 1 DisplayPort 1.2 (DP) 1 High Definition Multimedia Interface (HDMI) 1 Video Graphics Array (VGA) What's Included Monitor with stand Power Cable DVI Cable USB Cable VGA Cable This is the sort of thing that results; http://www.tomshardware.com/forum/132871-33-bought-wrong-cable-modified. Why can't they just make it simple? These are the options, whatever you select we will ensure that you can set it up right out of the box and everything will match perfectly. None of this confusion and selling something that will not work unless the customer goes and buys missing items. It's like selling a car and saying go and buy the tyres yourself. Radical concept. With a proper keyboard and the email address of a Dell corporate executive, I could write a really interesting email given my background in sorting out this sort of rubbish. Then again it could well be a waste of time. If Dell is not thriving it is probably reflective of this apathy.