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Nimbus

Token Irish Guy
Oct 22, 2008
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What would happen if I were to plug in two graphics cards into my PC at the same time? (One PCI, one PCI-E, one nVidia, one ATI.) I'm doing some testing on a possibly broken part, and I don't want to accidentally fry my PC.
 

Simalacrum

Resident Juggler
Apr 17, 2008
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Something tells me you shouldn't try it. If its a PC you care about don't do weird experiments on it! Try it out on some old heap you don't give a damn about instead! Unfortunately I'm not that tech-savy so thats the best advice I can give you :p
 

Aac18

New member
Mar 21, 2009
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I'm not an expert on the matter but I can tell you that providing your PSU (power supply unit) can provide enough power its technically possible to run both cards without "frying" it. My only worry would be the incompatibility issues using both a Nvidia and a ATI card in the same computer can cause.
 

Nimbus

Token Irish Guy
Oct 22, 2008
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Simalacrum said:
Something tells me you shouldn't try it. If its a PC you care about don't do weird experiments on it! Try it out on some old heap you don't give a damn about instead! Unfortunately I'm not that tech-savy so thats the best advice I can give you :p
I wish I could. I only have access to one computer with a PCI-E slot. And that would, of course, be my own personal, hand-built, gaming rig.

Aac18 said:
I'm not an expert on the matter but I can tell you that providing your PSU (power supply unit) can provide enough power its technically possible to run both cards without "frying" it. My only worry would be the incompatibility issues using both a Nvidia and a ATI card in the same computer can cause.
I hand-picked my PSU for quad-SLI compatability.

That won't be an issue, not with running some old ATI PCI card.
 

Aac18

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Mar 21, 2009
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Nimbus said:
I hand-picked my PSU for quad-SLI compatability.

That won't be an issue, not with running some old ATI PCI card.
Well if its capable of Quad-SLI then you certainly won't face any power issues. It really just comes down to if its possible to run two cards from different makers on the same computer. If you do decide to give it a go remember to install the drivers BEFORE installation of your second card or you can experience errors or full blown failure of the card (its not recognized so no power is supplied, etc).
 

Death8338

New member
May 23, 2009
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NEVER DO THAT! it doesnt work at all, you have to use the same type and they have to be SLI
(i use two of these http://www.newegg.com/Product/Product.aspx?Item=N82E16814150391 )
 

historybuff

New member
Feb 15, 2009
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I think your motherboard has to be SLI to do that.

Otherwise, if you are testing for bad parts--don't cut corners, just take it a little slower if you have to. It may be frustrating but it may save you from frying your computer.
 

Xyphon

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Jun 17, 2009
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http://compreviews.about.com/od/video/a/DualVideo.htm

This may help you. It lists both pros and cons of using two graphics cards.
 

Brnin8

New member
Jul 17, 2009
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If you somehow were to turn one off youd be fine, I wouldn't try both on at the same time though. Also make sure your MoBo is compatible.
 

Nimbus

Token Irish Guy
Oct 22, 2008
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Ok, to clear up the confusion, I am not trying to get them working in SLI or Crossfire or anything like that. I just need to see if the computer recognises the PCI-E card. Unfortunately, the PCI-E card isn't outputting video when I install it, and I can't test it in any other computer, so I have to explore other methods of testing.

EDIT: It seems like this guy [http://forums.techarena.in/vista-hardware-devices/1094319.htm] got away with it. The source is dubious to say the least, so I would still like someone who knows what they are talking about the confirm this.
 

cleverlymadeup

New member
Mar 7, 2008
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ok from someone who has done this on a regular basis, the only thing that will happen is that you will have 2 video cards in your system as long as drivers are installed for both cards

for the issue with your PCIe card, when does the video output stop? ie shows bios and then nothing after or does it show the bios start up and then black out

if it's the first one, then it's something in the bios, ie telling it to boot from PCIe, or it's due to the fact the card isn't in the slot properly, so just stick it in

if it dies during the windows loading screen, it's probly a strange resolution the card can't handle, you will can try loading safe mode and fixing the resolution there
 

Kriptonite

New member
Jul 3, 2009
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Something tells me that that will not be a good idea. I can't say anything for sure(I know, helpful right?) but I wouldn't test it on your 'gaming rig'.
 

FallenRainbows

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Feb 22, 2009
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Simalacrum said:
Something tells me you shouldn't try it. If its a PC you care about don't do weird experiments on it! Try it out on some old heap you don't give a damn about instead! Unfortunately I'm not that tech-savy so thats the best advice I can give you :p
Certian new nVidia cards do allow you to hook up two into a giant one. But I don't adivse doing it unless you know what your doing and have a beast of a cooling system. Liquid Nitro ftw!
 

Nimbus

Token Irish Guy
Oct 22, 2008
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cleverlymadeup said:
for the issue with your PCIe card, when does the video output stop? ie shows bios and then nothing after or does it show the bios start up and then black out
The monitor it is plugged into remains in standby mode, as if the computer hasn't been turned on at all. Zero video output.

As for the specifics, the PCI-E card (the broken one) is a 9800 GX2. Which is why I am really reluctant to give up on it. The PCI card (which I am currently using out of necessity) is an ATI Radeon x1550 (don't laugh).

EDIT:
McCa said:
Certian new nVidia cards do allow you to hook up two into a giant one. But I don't adivse doing it unless you know what your doing and have a beast of a cooling system. Liquid Nitro ftw!
New? That's been around since '98.
 

Nimbus

Token Irish Guy
Oct 22, 2008
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fluffybacon said:
And why are you really reluctant to give up on it? Nowadays you can get a 512mb 4870 of newwegg for >130$ and it will beat the gx2 by a good margin.
Thanks for the advice.

I was reluctant to give up on it because it's a €500 card and last I checked even a 1GB 4870 X2 comes second place to a GX2. (Although, it's very close)
 

cleverlymadeup

New member
Mar 7, 2008
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Nimbus said:
cleverlymadeup said:
for the issue with your PCIe card, when does the video output stop? ie shows bios and then nothing after or does it show the bios start up and then black out
The monitor it is plugged into remains in standby mode, as if the computer hasn't been turned on at all. Zero video output.

As for the specifics, the PCI-E card (the broken one) is a 9800 GX2. Which is why I am really reluctant to give up on it. The PCI card (which I am currently using out of necessity) is an ATI Radeon x1550 (don't laugh).
when you have only the one card plugged in does it make odd beeping noises when you turn it on?

also if it's under warranty, take it back and get it replaced with a new one

no one should have an ati card forced on them. i'm usually a huge supporter of Canadian stuff but ati has pissed me off one too many times, mostly cause their support for drivers and promised features suck

it does sound like the card is dead tho. if you have to get a new one stick with nvidia
 

Nimbus

Token Irish Guy
Oct 22, 2008
2,162
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You were right, it beats an HD 4870x2, but I was half right, in that a GX2 beats a regular 4870:

http://www.tomshardware.com/charts/gaming-graphics-cards-charts-2009-high-quality/compare,1342.html?prod%5B2558%5D=on&prod%5B2572%5D=on
 

Nimbus

Token Irish Guy
Oct 22, 2008
2,162
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cleverlymadeup said:
when you have only the one card plugged in does it make odd beeping noises when you turn it on?

also if it's under warranty, take it back and get it replaced with a new one

no one should have an ati card forced on them. i'm usually a huge supporter of Canadian stuff but ati has pissed me off one too many times, mostly cause their support for drivers and promised features suck

it does sound like the card is dead tho. if you have to get a new one stick with nvidia
Ok, here is all the info I have:

When it was running normally, I would start it up and the fans on the card would speed up for a few seconds and then slow down again. Just as the fans slowed down to normal speeds, the screen would turn on.

However, now that it is broken the fans remain at full speed and the screen never turns on.

Also, when I plug it in and turn on the computer the card lights up (Red if no PSU plugs are connected, green if they are), so there is some life in it. (It recognises when the computer turns on even when not connected to the PSU, and it recognises when it is connected up correctly)



I realise I might be being a bit paranoid, but I really don't want to shell out for a new card to find out that is was a busted PCI-E slot or something.