HD5450 Triple Monitor Support Problem

What I would do first is clear out the multiple-monitor setting by switching to just one monitor, restarting that way, and re-apply the desktop extension.

When you click "Detect" does it give you all three screens to work with, at least?

If the Display Port adapter is not of the "Active" variety you'll never get all three working. Is your adapter on this list?

AMD Eyefinity Validated Dongles

Mundle101 said:

...so i need to get the right dongle to use all 3?...

Yes.

...as i understand it u need to have a passive DP configuration for using more than 2 monitors on the same card

Exactly backwards. Passive Display Port works with one or two monitors. The only way to get the third working is with the Active dongle.

If I sound very sure of myself it's because I bought a new XFX 6870 and a third monitor two days ago. The box for the video card said it had two Display Port connectors, so I bought an AMD-Certified DP-to-DVI dongle. Unfortunately, the Display Ports on the card are of the Mini Display Port variety and my dongle was the regular type. No one seems to stock such a critter as the Mini DP-to-DVI locally so I took a chance on a passive dongle. Everything I had read told me it wouldn't work - and it didn't. I had the same result as you: I could get any two monitors I wanted to work, just not all three at the same time.

I almost jammed my 4870 card back in there out of frustration, but my PSU would be pushing its luck with two video cards in it. I ended up ordering one of these from Amazon:

Accell B087B-006B UltraAV Mini DisplayPort to DVI-D Single-Link Active Adapter ATI Certified (Black)

Amazon.com: Accell B087B-006B UltraAV Mini DisplayPort to DVI-D Single-Link Active Adapter ATI Certified (Black): Electronics

Now I'm just waiting for it to be delivered... :)

EDIT: See Post #4 for the link to AMD/ATI certified dongles if you don't want to get the one linked above. :)

EDIT (AGAIN): For some strange reason, the link to the AMD/ATI certified dongles includes some Passive ones. GET THE ACTIVE!!!

Mundle101 said:

Thanks for your Help i never heard of a display port till recently, Ive got the right one shipping soon..

Let us know if it works!

jelyman said:

Let us know if it works!

Definitely do that - this thread will almost certainly be helpful to someone else, too. :)

profdlp said:

jelyman said:

Let us know if it works!

Definitely do that - this thread will almost certainly be helpful to someone else, too. :)

Helpful to me. I got a graphics card with DP today and didn't know about active/passive dongles.