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ASUS HD 6570 won't do dual-monitors with Dell Optiplex 745 Tower

Posted on 2012-04-10
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Last Modified: 2016-11-23
Hi folks, I've been trying to get a group of computers up on dual monitors at my workplace. Actually, let me back up. I HAD these machines running with dual monitors already, but then had the genius idea of upgrading to Windows 7.

As it turned out, the video cards in the Dell machines are not supported in Windows 7. No biggie, found a card that I was able to find chatter online about as being functional in Windows 7 64-bit. That card is the ASUS HD 6570. Not a great card by any means, but perfectly good for office work.

Here's the issue I have. Only the VGA output works. These cards have a VGA, HDMI, and DVI output. I've read where people actually use all 3 outputs and drive 3 monitors with them. I'm using the same VGA to DVI adapters I used on the old cards, but there's simply no output on them. I don't have anything to test the HDMI port.

The BIOS on these Dells is confusing. There are only two options, 'Auto', or 'Card', but both options apparently disable the onboard video if a card is detected. In either case, the onboard video doesn't work as long as the card is installed, and that's not a big issue if not for the fact that the DVI outputs don't work on the card. And I've tried all 3 of them, so I don't think its a defective card or anything.

I downloaded the catalyst software and there's nothing in there that would seem to indicate the card needs to be 'turned on' in software. It should just be hot when the machine boots up.

Am I crazy? Missing something obvious here? I've updated the BIOS on all of these machines and they're completely up to date. I mention the OS but I'm not even sure why that would apply in this case. Is it possible that the BIOS is disabling the other outputs on the card? Why would it even do that?
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Question by:IT Gal
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by:RaithZ
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From what I have seen with that card, you are not alone.  The DVI port on that card does not support using the VGA adapter connectors like older cards have.  However it seems you should be able use a DVI and a VGA connection at the same time without the adapter. (Assuming you have a monitor with a DVI connection).
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by:IT Gal
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@RaithZ - I saw someone post that they used an adapter and it worked fine. I don't think I have anything to test with (that has a DVI connection only) but I can look around.

I actually have a VGA to HDMI converter, but it works in the wrong direction, so thats no help.

Is it possible that a newer DVI adapter is needed? Are there differing models of DVI adapter?
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Callandor earned 250 total points
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That card probably has a DVI-D port (http://www.jr.com/asus/pe/ASU_6570DI1GD3L/), which means it only supports digital signals, and that means DVI-VGA adapters will not work - VGA is analog and the adapters only work with DVI-I ports.  Anytime you go from digital to analog, you need electronics, so an adapter won't be able to do the conversion.  The solution is to get a card that outputs DVI-I or use a monitor with DVI inputs.
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