The problem with that is that I have no devices that use displayport. So the only way I have to test if one of those works is to actually get the card. It sure has been hard actually getting information from amd or any of the vendors about these cards or what works with them.
They make a card with 6 mini-displayport interfaces which is pretty much not used anywhere. If they had 6 mini-hdmi or mini-dvi then it would have been trivial to make this stuff work with any monitor out there. If they had done 6 mini dp+ instead of 4 mini dp and 2 dp+ then this would also not be a problem since you could use 6 passive hdmi/dvi adapters.
For such a nice card it seems like the choice of outputs really screws things up. I went and looked through the active displayport to dvi/hdmi adaptors and it seems like most of them overheat and shut off after a while. Lots of problems where reported for darn near all of them. Based on the forums the VGA ones where a little complex to get windows to recognize the right monitor resolution on the ones that didn't send the EDID information. However I have run into those issues on windows before and on linux it was never an issue since I just put the resolution in the config file. So from everything I read the VGA ones are more reliable in actually working but knowing for sure that they work is so hard to actually find the information on.
I could get two passive mini-displayport to hdmi and two active mini-displayport to hdmi and the active ones will cost about $100 each but it seems like they are even more likely to have problems. I could also replace all 4 of my monitors with newer displayport interface monitors but to get PVA or better panel quality would run about $500-$800 each and that is pretty silly considering the current monitors work flawlessly just not with the port that amd chose which almost no monitors support. I know that TN panels are cheaper but I don't consider a TN panel an option.