Dual ATI video cards with DELL Optiplex 760

I've got a brand new DELL OptiPlex 760 and am attempting to run two add-in video cards.  1.  ATI Mobility Radeon 7500 - PCI and 2. ATI Radeon HD 3450 - PCIe.  The problem I'm having is regarding the 7500.  The device will not start and gives this error code under device status:

This device cannot start.  (Code 10)

I have a total of three monitors.  The 3450 came with the PC and has dual monitors.  I wanted to add a third monitor and attempted to run that off the onboard graphics card.  The folks at DELL told me this wasn't possible with my motherboard and told me to order another add-in card.  so I ordered the 7500 and am having the problem mentioned above.  Any suggestions?
SupermanTBAsked:
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CallandorConnect With a Mentor Commented:
There's the HD2400 Pro PCI that jamietoner recommended: http://www.newegg.com/Product/Product.aspx?Item=N82E16814131082 
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jamietonerCommented:
You running Vista or XP?
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jamietonerCommented:
If it's vista the problem is the cards don;t use the same driver, you'd need to get a newer model ATI pci video card that uses the same driver as the 3450. Here's one for example. http://www.newegg.com/Product/Product.aspx?Item=N82E16814131082
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SupermanTBAuthor Commented:
I'm running Windows XP
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CallandorCommented:
How did you get a Mobility Radeon 7500 in a PCI form?  That's a notebook video card, and it's pretty old as well.  You may want to use something more standard that's newer, like a Radeon 9250.
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SupermanTBAuthor Commented:
The device manager says Mobility Radeon, however, the card I actually have is below.

http://www.provantage.com/diablotek-v7500-p128~7DIAB00F.htm

I installed the drivers from the disk and assumed those were correct.  I also tried to get the drivers off the ATI website, but they weren't available.
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CallandorCommented:
The fact that device manger did not correctly identify the card leads me to think the card is too old or not compatible with your driver.  You can't load two different Radeon drivers, and using two different manufacturers is difficult.
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SupermanTBAuthor Commented:
Is there a particular reason you can't load two different Radeon drivers?  I've never heard of this before.
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jamietonerCommented:
Usually because the drivers won't play nicely with each other. There is a work around that I have seen work(I usually work with nvidia cards) is to remove all the drivers and software for both cards, restart then load the oldest driver first(7500) then the driver for the newest(3450). If that doesn't work I'd return the dinosaur(can't believe they are selling them for $42) and get a pci card with a newer chipset like the one i posted earlier.
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CallandorCommented:
>Is there a particular reason you can't load two different Radeon drivers?Is there a particular reason you can't load two different Radeon drivers?

The hardware has fixed address locations.  The drivers interact with the hardware using those addresses.  If you had more than one driver, how does each one know when it's supposed run, and for which card?  It would get confused and crash your system.  When you load a driver, it checks for an existing one and uninstalls it before it installs itself.
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SupermanTBAuthor Commented:
Because I've had a similar setup on several computers with two Nvidia video cards and everything works fine.  Unless there is something specific to the Radeon cards, I'm absolutely 100% positive that two video cards from the same manufacturer can be run on the same computer without much difficulty.

Unfortunately in this occasion I have ATI cards instead of Nvidia cards which brings me here.
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CallandorCommented:
People use multiple video cards from the same manufacturer all the time - this is not the same thing as trying to use two drivers.  The trouble in your case is that you're using a card which is so old it isn't supported in the drivers anymore.
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SupermanTBAuthor Commented:
I'll be happy to try another card if that's what we conclude, but I'm absolutely positive I've used two different video cards, from the same manufacturer using two different drivers.   For example, the computer I'm using now uses both the NVIDIA Quadro NVS 440 & the NVIDIA GeForce 6150 LE.  I can see both devices in the device manager and both video cards function properly.
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CallandorCommented:
The two cards you have are in different families, which might account for why they don't interfere with each other.  The 7500 and HD3450 both use Catalyst, but I don't think ATI bothers to make sure the 7500 works with it anymore.
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SupermanTBAuthor Commented:
OK, well it sounds like the 7500 is just a crappy card and I need to use something else.  Is there a PCI card that you feel confident would work in place of the 7500?
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SupermanTBAuthor Commented:
and that will definitely work?
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CallandorCommented:
I've used the same driver on cards above (HD4850) and below (9250), so I am confident it will work.
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SupermanTBAuthor Commented:
Just to play devil's advocate before I go so far as to return the other cards and order two new ones.......you don't believe there is any merit to DELL telling me that the motherboard is incapable of supporting two video cards?
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jamietonerCommented:
The motherboard supports it but the tech is trained not too.
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SupermanTBAuthor Commented:
OK...last question, then I'll order the suggested card.  One of the tech's did mention that the motherboard is not SLI compatible, which is required for dual video cards.  Do you all believe there is any truth there?
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CallandorCommented:
The tech is focused on high end gamers who use two identical cards for SLI.  He's wrong because SLI applies only to nVidia cards (ATI uses Crossfire), and he's wrong because a PCI-e card plus a PCI card does not require an SLI motherboard - just one PCI-e x16 slot and one PCI slot, which most new motherboards have.
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SupermanTBAuthor Commented:
Excellent, well I'm off to order the suggested video card.
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SupermanTBAuthor Commented:
I just ordered the suggested card.  I'll be going on vacation next week.  If they arrive before I go, I'll install and post a reply.  If not, it will be about 2 weeks.  Thanks guys.
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jamietonerConnect With a Mentor Commented:
The motherboard will support as many video cards as you have expansion slots. It's true the board doesn't support SLI or Crossfire but that's not needed for multiple monitor support, SLI and Crossfire are mainly for improving graphics performance in games and a few other apps. Guess we will hear more in a couple days or a couple weeks.
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SupermanTBAuthor Commented:
That suggested video card worked great.  Learned something new.  Thanks so much for the help.
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