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faridr

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Nov 22, 2012
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Hey guys, I'm planning to add another hd 6870, entering the crossfire world. My current motherboard is Asus M5A88-V Evo, with 2 PCIe slot, x16 and x4 mode.

I found a used DFI LANParty DK 790FXB-M3H5 with 3 PCIe, two x16 and one x4 mode for sale in local forum, and I could sell my Asus and buy the DFI board with 30 dollars to spare.

I know I'll be losing usb 3.0, and am3+ compatibility (which I dont care, will be sticking with phenom II 960t for years). Is it worth the downgrade? What else will I be losing?

Thanks in advance!
 
Solution
oddlyinsane
First and foremost, your CPU will SLIGHTLY bottleneck 2x 6870s. This should be eliminated somewhat by overclocking.

Secondly, your motherboard is fine. x4 will not bottleneck a 6870. It is not worth the downgrade as that is what it would be.
The image below shows 2x 480s in SLI. x16/x16 vs x4/x4. There is barely no difference and this is max settings at 2560x1600 resolution. There is no bottleneck.

http://www.anandtech.com/bench/Product/290?vs=309
The above link shows how the 480 is much better than a 6870. If 2x 480s aren't going to be bottlenecked, let alone 2x 6870s.
1282682382IabXi1rEcG_1_4.gif


It is more likely that your CPU will be the bottleneck, though minimally.

Hope this answers...
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oddlyinsane

oddlyinsane

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Mar 11, 2012
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First and foremost, your CPU will SLIGHTLY bottleneck 2x 6870s. This should be eliminated somewhat by overclocking.

Secondly, your motherboard is fine. x4 will not bottleneck a 6870. It is not worth the downgrade as that is what it would be.
The image below shows 2x 480s in SLI. x16/x16 vs x4/x4. There is barely no difference and this is max settings at 2560x1600 resolution. There is no bottleneck.

http://www.anandtech.com/bench/Product/290?vs=309
The above link shows how the 480 is much better than a 6870. If 2x 480s aren't going to be bottlenecked, let alone 2x 6870s.
1282682382IabXi1rEcG_1_4.gif


It is more likely that your CPU will be the bottleneck, though minimally.

Hope this answers your question. :)

Edit: SLI is NVidia's version of AMD's Crossfire technology. Technically, there will be no difference in regards to x4 motherboards.
 
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faridr

Honorable
Nov 22, 2012
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10,540
Awesome, thank you on that!

As per my processor, it is overclocked to 3.3 ghz as it has been unlocked to 6 core. Will that do just fine? I could always go back to 4 core and 3.8 ghz if it would reduce the bottleneck.

I always though that most processor architecture starting from Intel socket 775 and AMD AM3 does not bottleneck current available graphic card (read it somewhere, cant remember). I guess it is different for crossfire/sli

I'm all ok with in depth explanation as I have years of experience with computers (mostly low end computer and theory), but still new to overclocking and crossfire/sli world after I could afford to pay for my own hardware.
 
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oddlyinsane

oddlyinsane

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Mar 11, 2012
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Your CPU should be fine, whether 6 core or 4 core, varying clock speeds. It will be fine.

Not all CPUs are powerful enough to support even 1 GPU, let alone 2. For example, an Intel Core i3 3220 would have a hard time feeding, say, a GTX Titan :p

As always, if I have helped, please consider selecting my answer as the solution. Thanks ;)
 
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