Trying to run three screens on same desktop

J

[email protected]

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using a HP e9210t PC with a motherboard with a PCI 16 slot and several PCI express 1x slots. The ATI Radeon 4850 came with the system, and can run two screens, but when I installed an additional card (ATI Radeon 4350) the driver overrode the 4850 and only recognized the 4350 card.
I was hoping someone would know how to tweek the system to recognize both cards. According to ATI, the driver is the same for both cards.
 
[email protected] said:
using a HP e9210t PC with a motherboard with a PCI 16 slot and several PCI express 1x slots. The ATI Radeon 4850 came with the system, and can run two screens, but when I installed an additional card (ATI Radeon 4350) the driver overrode the 4850 and only recognized the 4350 card.
I was hoping someone would know how to tweek the system to recognize both cards. According to ATI, the driver is the same for both cards.
Click to expand...

Seen this problem before (I use 6 monitors myself, often with 3 different video cards) - the trick is:

1) Put in one of the cards (doesn't matter which), install drivers.
2) Shutdown, take out the card, put in the other card in the other slot (do *NOT* put the second card in the first card's slot), start up computer and install drivers if necesary.
3) Shutdown, put in first card again without taking second one out, restart computer.

This should do the trick - learned it from VIA Technologies when they introduced their hybrid AGP/PCI-E chipsets. I actually tried to get Crossfire working on an AGP card... :D
 
I am working on the same machine described above. I have tried onstalling the way you said and still no good. Any othe suggestions
 
Louis019 said:
I am working on the same machine described above. I have tried onstalling the way you said and still no good. Any othe suggestions
Click to expand...

You might want to take a very close look at the PCI-E lane structure of the motherboard. On my old P5WD2 I could ohly turn on the PCI-E x1 slot if I reduced the PCI-E x4 slot (x16 physically) to an x2 electrically. It might be that putting something in the x1 slot is disabling the x16 slot, or at the least cutting off too many lanes - most AMD video cards are touchy with less than x4 lanes. I did quite a bit of trial and error before I found some that worked fine in x1 and x2 condtions (Dell X300's).

What OS are you using? I've successfully done this with various video cards in Windows 98SE, XP, Vista, 7, and Ubuntu 8.04.
 
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