Can you crossfire two different makes?

[nibnab]

Would it be OK to crossfire two different makes of the ATI 6870 card?

 

[cmndr_andi]

You sure can.

 

[CAT-THE-FIFTH]

Yes,although you will need to have both cards running at the same clockspeeds IIRC.

However,the MSI 870A-G54 runs the second PCI-E slot at 4X meaning it is not capable of doing symmetrical Crossfire.

 

[nibnab]

symmetrical Crossfire?

I've read that having one on 4x doesn't really affect performance

 

[cmndr_andi]

You do seem to be right - this article shows that even in x4/x4 configuration - dual GTX 480s still perform well.

 

[banger9365]

here thiers a list of gpus that can be xfired with each other http://sites.amd.com/PublishingImag.../WebBannerJPEG/AMD_CrossfireX_Chart_1618W.jpg

 

[CAT-THE-FIFTH]

symmetrical Crossfire?

I've read that having one on 4x doesn't really affect performance

One card will run at 16X and the other at 4X.

With an HD5870 it seems you will loose around 5% performance so maybe it won't be too bad:

http://www.techpowerup.com/reviews/AMD/HD_5870_PCI-Express_Scaling/25.html

 

[nibnab]

Thanks guys

 

[hdpcgamer]

Running Crossfire/SLI in x16/x4 mode?

+1

I think I'm going to start up my own thread regarding dual-GPUs.

 

[Final8y]

Yes,although you will need to have both cards running at the same clockspeeds IIRC.

However,the MSI 870A-G54 runs the second PCI-E slot at 4X meaning it is not capable of doing symmetrical Crossfire.

The cards do not have to be running at the same speeds & that's as even as far back as 1900xt CF.

Maybe that limitation is or was connected with SLI but its never been one with CF.

 

[DrBombcrater]

Yes,although you will need to have both cards running at the same clockspeeds IIRC.

Crossfire is really tolerant of different cards. All it cares is that the cards have GPUs of the same or very similar design. Brand, clockspeed, shader count, memory size and model don't matter.

You can, for instance, crossfire a 512MB 4850 and a 1GB 4890.

 

[hdpcgamer]

Crossfire is really tolerant of different cards. All it cares is that the cards have GPUs of the same or very similar design. Brand, clockspeed, shader count, memory size and model don't matter.

You can, for instance, crossfire a 512MB 4850 and a 1GB 4890.

Is that the same with SLI?

 

[cmndr_andi]

Is that the same with SLI?

Unfortunately not - with SLI you need the same model (though different brand and clockspeed cards will work together).

For example - a GTX 460 768MB will not work in SLI with a GTX 460 1024MB, as it has a different model GPU.