1
I have an ATI Radeon HD 4850 graphics card in my computer. It has two DVI sockets and an S-Video / TV-OUT socket. There are alreay two monitors connected to the two DVI sockets.
I have a third (currently unused) monitor with DVI and VGA (Sub-D) connection.
Is it possible to use this third monitor with this graphics card?
If yes: How do I connect the monitor to the graphics card?
Are there any adapters or cables between S-Video / TV-OUT and DVI or VGA?
I use Linux as OS with the fglrx drivers. While the configuration may become difficult, too, my current problem is the hardware connection.
graphics card specification: http://www.amd.com/us/products/desktop/graphics/ati-radeon-hd-4000/hd-4850/Pages/ati-radeon-hd-4850-specifications.aspx
2Here's a better question: Does that card have 3 RAMDACs? – Ignacio Vazquez-Abrams – 2013-01-17T16:46:36.447
I added a link to the specification. From the spefication: Two integrated 400 MHz 30-bit RAMDACs. Each supports analog displays connected by VGA at all resolutions up to 2048x15362. – user63835 – 2013-01-17T17:03:43.700
2That means even if you can attach a third display it can only mirror what one of the other displays is showing. – Ignacio Vazquez-Abrams – 2013-01-17T17:10:43.213
Thx for your help. Just want to be sure. Aren't the DVI connections digital? If yes, why do they need the RAMDACs? And wouldn't be at least one of them availible for S-Video? I don't know how flexible the graphics card's architecture is. – user63835 – 2013-01-17T17:22:37.903
1DVI-D is only digital. DVI-I and DVI-A both make use of a RAMDAC. – Ignacio Vazquez-Abrams – 2013-01-17T17:28:24.507
I am afraid you are right. Found this in the specification which sounds similar to what you wrote: Two independent display controllers. Drive two displays simultaneously with independent resolutions, refresh rates, color controls and video overlays for each display. – user63835 – 2013-01-17T17:37:16.583