As well as the ability to daisy chain and expand with an external hub (which don't exist yet, or at least I haven't found one). I do like the self locking cable compared to the screw in type, it's something I wish HDMI, SATA, and USB cables had as standard as well. But I digress. DP is a thinner cable, and is the future.
DP doesn't support higher resolutions than Dual-Link DVI. The only difference you can see is that DP takes longer to initialize.
Though there was a period of time a short while ago when the driver was unable to display a resolution of 640x480 (for an old game) on my ZR30w over DP, but was on my LP3065 over DVI via an active DP adapter. That was when I used the XFX 4GB 5970 which had six mini-DP ports.
Alright, monitor is getting on my nerves. Today I go to cut it on, won't turn on, have to unplug and replug to get to to turn on, and while gaming it blacked out twice for about 2 seconds each time. I switched to a DVI cable in case it was just a DP issue (doubtful, but it is basic troubleshooting), but it looks as if I might have to test that warranty...Sounding like a faulty control board or power supply.
Wanted to revive this topic to say that apparently I WAS having issues, the blasted thing died on me today, wouldn't turn on (I'm on my laptop now). Called HP and after a transfer to the right department because the product number on my monitor points to a HP Pavilion Elite desktop which is...wrong, they said it was most likely the power supply and are going to attempt to overnight a replacement. They said they could get a tech out to replace it tomorrow BUT they can't say when he will be here and I've got to...work. Waiting on a call back from him right now to see what we can do. Maybe I should have got the Dell UltraSharp, it was just on sale for $100 cheaper than I paid for this HP and is about $80 cheaper now.