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Comparing SLI/Crossfire support on Gigabyte GA-990FXA-D3, and ASUS M5A99FX Pro R2.0

Tags:
  • Motherboards
  • Crossfire
  • Gigabyte
  • Quad Crossfire
  • SLI
  • Asus
  • GPUs
Last response: in Motherboards
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April 30, 2014 5:06:20 PM

I am comparing two motherboards, the Gigabyte GA-990FXA-D3, and the ASUS M5A99FX Pro R2.0.

Both are 990FX/SB950 chipsets, and both have:
2x PCI Express 16x (Running at 16x)
2x PCI Express 16x (Running at 4x)

Yet the gigabyte apparently only supports 2 GPUs, where the Asus supports 4 GPUs.

What is the difference? Are gigabyte just lying so I will buy a pricier model, or will the gigabyte actually not support 3 or 4 GPU setups?

More about : comparing sli crossfire support gigabyte 990fxa asus m5a99fx pro

Best solution

a c 104 V Motherboard
a b Ĉ ASUS
April 30, 2014 7:10:12 PM

Current AMD cpu's have 40 pcie lanes. So whats happening is Gigabyte did not run the extra 4 lanes to the two x16 slots(at x4) is all.
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April 30, 2014 8:29:19 PM

popatim said:
Current AMD cpu's have 40 pcie lanes. So whats happening is Gigabyte did not run the extra 4 lanes to the two x16 slots(at x4) is all.


Oh that makes sense, thanks for clearing that up.

A follow up question:
I want to run two dual-GPU cards, for example two HD7990's.
Since this setup would only be using the two PCI slots that run at x16 and not the two running at x4, would the gigabyte motherboard support this setup, which is actually a 4 GPU setup, but only two physical cards?
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