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Windows 7: Dual Graphic Card

16 Nov 2011   #11
Jetson

Windows 7 Pro x64
 
 

I think a lot if not all graphics card with DVI are able to output to VGA with a simple DVI to VGA adapter. So you only need a card with 2 DVI output (and of course 2 adapters).


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16 Nov 2011   #12
Maguscreed

Microsoft Community Contributor Award Recipient

Windows 7 x64
 
 

Quote   Quote: Originally Posted by Jetson View Post
I think a lot if not all graphics card with DVI are able to output to VGA with a simple DVI to VGA adapter. So you only need a card with 2 DVI output (and of course 2 adapters).
You are correct sir.
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16 Nov 2011   #13
stormy13
Microsoft MVP

Win 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by Jetson View Post
I think a lot if not all graphics card with DVI are able to output to VGA with a simple DVI to VGA adapter. So you only need a card with 2 DVI output (and of course 2 adapters).
I wouldn't be too quick to go looking at dual VGA via adapter on dual DVI as most of the cards today with dual DVI ports only support VGA from one of them,

Dual monitor not recognized

EAH HD6870 multiple display problem

It is possible that the few cards out now that have both a VGA and DVI port on them might support VGA via adapter on the DVI port, but I would be contacting the card manufacturer first to confirm if it does or not.
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16 Nov 2011   #14
Jetson

Windows 7 Pro x64
 
 

That's exactly why I never said I was 100% sure (both DVI to VGA).
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16 Nov 2011   #15
Maguscreed

Microsoft Community Contributor Award Recipient

Windows 7 x64
 
 

I can attest to xfx doing it. Newer cards that support eye finity also will automatically detect an adapter in use and make the required changes. ...that's for ati of course. I haven't owned a new nvidia card in several years now so I don't know how they are handling that.
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16 Nov 2011   #16
stormy13
Microsoft MVP

Win 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by Maguscreed View Post
I can attest to xfx doing it.
Not on their current AMD line up. This is from one of their cards (HD 6950),

Dual Graphic Card-backplate.png

VGA via adapter from only one of the DVI ports, the other will not work with the adapter. Can't say anything about Nvidia cards from XFX as all they have are the low end Fermi based cards, most of which come with a native VGA port,

Newegg.com - Computer Hardware, Video Cards & Video Devices, Desktop Graphics / Video Cards, XFX, NVIDIA, GeForce G/GT series

I would be contacting XFX before assuming that the cards support VGA from the DVI port.


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16 Nov 2011   #17
Maguscreed

Microsoft Community Contributor Award Recipient

Windows 7 x64
 
 

One thing I have noticed is many people that I find complaining of vga not working for them are trying to run 1080p resolutions through the vga adapter.
This will not work properly.
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23 Nov 2011   #18
Jetson

Windows 7 Pro x64
 
 

Finally, cost me 16$ for a HD5450. Put it as second GPU (primary is HD3870) and everything works like a charm including HD-Audio bitstream.

Thanks to everyone!
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24 Nov 2011   #19
gazz9496

 
 

johne53 most graphics card come with adapters for dvi-vga, the ones with a vga port already on them generally don't but they are easy to pickup for a very low cost. around 5 less if you look around obviously.

both of my last 2 sapphire ati cards came with 1 x dvi-vga and 1 x dvi-hdmi.

the shop i work in sells the adapters as well so they are fairly easy to come by.
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25 Nov 2011   #20
johne53

Windows 7
 
 

Thanks Gazz and everyone else who's been providing suggestions. However I think there's some confusion creeping in here. VGA is an analogue format. DVI / HDMI etc are digital formats. You'd need an external box to convert between the two. You can't do it with an adapter lead. Unless.... the card is fitted with a dual HDMI / VGA socket. As others have pointed out here, there are several cards on the market where the main HDMI socket reserves a few pins for providing a complementary VGA output. In that case, you can either obtain HDMI or (with a suitable cable) VGA from the same socket. Unfortunately, this feature tends to be only available from the primary output. Digital cards with two outputs don't normally provide that feature on the second output. The second output is digital only as you've noticed yourself. Therefore it can't be directly connected to an analogue monitor. A converter box isn't out of the question but ideally, I'd prefer not to have one. It's just something else that I'd need to buy batteries for....
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