2 4870s in Xfire and Crappy GPu Possible?

[vanbuskirks]

Hello, I am trying to create a triple monitor setup using ATI cards while still having crossfire enabled. I was hoping it would be possible for me to have my two 4870s in Xfire (supporting 2 monitors) and a random Gpu (most likely crappy) supporting the 3rd. Is this possible? If not, any other suggestions?

 

[hunter315]

What motherboard do you have? Do you already have both 4870s? You can use a third GPU to support additional monitors, but you need to make sure that your motherboard can accommodate 3 GPU.

If your motherboard cant, you can switch it for 2 5770s in CF or a 5870, they will perform about the same but will allow you to use 3 monitors, but one of them will need to be display port or you will need an active adapter.

 

[vanbuskirks]

What motherboard do you have? Do you already have both 4870s? You can use a third GPU to support additional monitors, but you need to make sure that your motherboard can accommodate 3 GPU.

If your motherboard cant, you can switch it for 2 5770s in CF or a 5870, they will perform about the same but will allow you to use 3 monitors, but one of them will need to be display port or you will need an active adapter.

I have a Gigabyte that has 2 PCIe 2.0 x16 slot, one PCIe 2.0 x8 slot. I have the 4870s two running at 16 (currently) but with 3 they would all run at 8x.

 

[Raidur]

8x is plenty of bandwidth for a 4870, no worries there.

As you can see a 5870 doesn't get too significant of a performance hit from even x4!

 

[firebird]

Maybe I'm missing something here, but why can't you just connect 2 monitors to 1 card, and 1 monitor to the other?

I had a dual card Crossfire setup with 1 monitor on each card and it worked fine. Is there some Catalyst restriction on Crossfire and two monitors?