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Radeon 7870 graphics card one DVI port problem for dual monitors.

Last response: in Graphics & Displays
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April 15, 2013 3:19:05 PM

Hi,

Any help will be appreciated. I'll try not to waffle on too much.

Basically, I made my first build a couple months ago. I bought a Radeon 7870 core edition.
http://www.scan.co.uk/products/2gb-xfx-radeon-hd-7870-c...

I then later tried to set up dual monitors (both of which are quite old). Having spent all of the money on the computer, I now have very very little left for any new parts. These are the monitors I own:

http://www.isylan.com/view-lot.aspx?id=9316&itemsperpag...

http://www.pcmag.com/article2/0,2817,1525985,00.asp
I think it there is a DVI-D and a VGA port on the back

I only have one monitor working just now and it is set up with a VGA cable with an adapter on the end for the DVI port on the graphics card.

Both monitors will work on the top port but will not work when plugged into the bottom port. It has been suggested to me that a split cable will make both of them work. However, when researching this I have come across the problem where the screen is simply duplicated, not stretched.

Is there any solution to this? I'm a little confused about the difference between the top and bottom port.

Would an HDMI- DVI cable work instead?
A new type of monitor? (bearing in mind that I probably don't have enough for a new one)
A new graphics card is kind of out of the question.
Perhaps some adapter that I don't know about that will make the second monitor compatible with the bottom port?

When it comes to cables, i'm probably a little slow so a slightly simplified answer would be great!

April 15, 2013 3:24:31 PM

No a split cable will not make it work, and simply connecting a second monitor will not enable it.

The second monitor must be turned on via Software before you can view anything on it within Windows.

The easiest way to test if its functioning properly, is connect both monitors and restart your computer. If you see the POST information displayed on both screens, then they are correctly connected. From that point, all you have to do is adjust display settings to enable the second screen.

http://howto.cnet.com/8301-11310_39-57448283-285/add-an...

About halfway through the Video they show how to enable via software.
April 16, 2013 3:19:08 AM

Thanks for the reply. I think I have already tried that but will do it again just in case. I had a look at the graphics card box and found this image:
http://imageshack.us/photo/my-images/407/20130416093711...

I have the monitor i'm using now plugged into DVI port 1. I'm not sure what "DVI port 2 is a digital signal only" means. Sorry, I am clueless.

Could the problem be that I don't have the right cables? (a VGA with DVI adapter and a seperate DVI-VGA cable)
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