Problems getting eyefinity setup

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forindooruseonly

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Jan 23, 2014
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10,510
So I am trying to get my third monitor working. I've been using two Asus PA248Qs for a while with an AMD 7800 series card, one hooked up via DVI and one to HDMI. I decided to add a third monitor, so I purchased another Asus of the same model.

I followed this thread for connections:

http://www.tomshardware.com/forum/id-803443/eyefinity-setup-guide.html

and ordered this active adapter from Sapphire:

http://www.newegg.com/Product/Product.aspx?Item=N82E16814999034

So, I have one monitor via DVI cable, one monitor via HDMI to DVI cable, both working.

When I hook the third monitor up via the adapter and DVI cable up, the computer never recognizes the third monitor on the adapter. No ding, no new hardware found - it never sees it.

If I plug it in without an adapter via an HDMI to mini displayport cable, it will recognize it but of course doesn't let me extend the desktop to it without deactivating one of the other monitors.

Is my adapter bad? Or since my monitors support displayport, do I need to find a miniDP to DP cable?

I'm not super savvy with this, so any help would be greatly appreciated. Thank you.
 
Solution
bryonhowley
Getting a mini DisplayPort to DisplayPort cable would be your best option and just bypass the adapter all together. You could also get a mini DisplayPort to DisplayPort adapter if you already have a DisplayPort cable either would work. It sounds like for what ever reason the active adapter is not working. A cable or mini>DisplayPort adapter would not cost much and should solve the problem completely.

But as a side note if you are planning on gaming with a 1080p Eyefinity a single HD 7800 will not cut it. You would need to Crossfire two of those cards to even get a adequate frame rate. What exact model HD 7800 do you have?
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bryonhowley

bryonhowley

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Oct 24, 2011
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Getting a mini DisplayPort to DisplayPort cable would be your best option and just bypass the adapter all together. You could also get a mini DisplayPort to DisplayPort adapter if you already have a DisplayPort cable either would work. It sounds like for what ever reason the active adapter is not working. A cable or mini>DisplayPort adapter would not cost much and should solve the problem completely.

But as a side note if you are planning on gaming with a 1080p Eyefinity a single HD 7800 will not cut it. You would need to Crossfire two of those cards to even get a adequate frame rate. What exact model HD 7800 do you have?
 
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Solution
F

forindooruseonly

Honorable
Jan 23, 2014
3
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10,510


Thank you for your answer, I'll order a cable and see what happens. Local place doesn't have one. I'm using a 7870? This one:

http://www.newegg.com/Product/Product.aspx?Item=N82E16814202024

I'm not trying to game with it, I just really need three monitors for workspace. I wanted to play around with eyefinity and see if I liked it, but realistically, I'm going to be using it as three separate monitors the vast majority of the time.
 
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forindooruseonly

Honorable
Jan 23, 2014
3
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10,510


New cable worked fine. Thank you for helping!
 
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