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GA-870A-UD3 Crossfire?

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December 28, 2010 2:05:38 PM

Will the GA-870A-UD3 do Crossfire? The 870 Chipset has the 22 lanes of PCIe required, similar to the 880G, and 890GX, and I know that some other boards, from ASRock (for example) are able to do it, so I was wondering if its possible?

Thanks,
Taylor

More about : 870a ud3 crossfire

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a c 715 V Motherboard
December 28, 2010 2:35:39 PM
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No, sorry your MOBO does not support Crossfire :(  - http://www.gigabyte.us/products/product-page.aspx?pid=3... I also looked at your manual to confirm and there's no mention of Crossfire or SLI.

You'd need a NEW MOBO with CF feature.

December 28, 2010 3:19:08 PM

Damn. Well, thanks anyways. I never thought I'd be doing Crossfire when I bought my computer, until now.
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December 28, 2010 3:19:28 PM

Best answer selected by c0oim4n.
a c 715 V Motherboard
December 28, 2010 3:48:43 PM

If that's the worst thing that happens to you then you're really lucky!

eBay the old and get a new one... :) 
May 19, 2011 5:46:48 AM

I know this thread is old, but this is just for the record.

I have the above motherboard (I will be replacing it very soon but regardless....) and Crossfire does work on it even though it is not officially supported. The first card will work at x16 in PCI-E 2.0 specification and the second in x4 PCI-E 2.0 (equivalent to PCI-E 1.1 @ x8 speed). Depending on the application there is no bottlenecking.

In ShaderToyMark (a extremely GPU taxing DX11 benchmarking tool) my system achieves (@ 1920x1080, no AA) only 45 (7 frames per second) points without Crossfire Enabled. With Crossfire enabled I get 94 points (15 frames per second) or a 208% increase!!! notice the low fps and you see what I mean about it being taxing.

Now I would imagine with Anti-aliasing on, the second card running on PCIE VERSION 2.0 x4 would become a constraining factor, but ShaderToyMark does not seem to have the option to enable AA at this stage.

Personally I would like to make the extra bandwidth available so i've got an ASUS M4A89GTD USB3 mobo on the way, So i can run both cards at PCI-E 2.0 x 8.

To summarise, it is possible to run Crossfire on a Gigabyte 870A UD3 motherboard, however depending on the game or application and the settings (particularly Anti-Aliasing), your results may be constrained by the PCI-E 2.0 x4 slot.
May 19, 2011 5:48:08 AM

I forgot to mention that the two cards are both Powercolor 6850 1GB cards, on the above motherboard with a Phenom II X6 1090T @ 3.6ghz and 8gb of DDR3 - 1333 RAM.
!