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Worth getting a second 7870 Tahiti @ PCIE x4 mode?

Tags:
  • PCI Express
  • Graphics Cards
  • Motherboards
  • Graphics
Last response: in Graphics & Displays
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December 24, 2013 1:41:45 AM

I have a Asrock H77M motherboard and a 7870 XT Tahiti-based video card.

My motherboard supports CrossFireX, so I was going to buy a second Tahiti-based video card.

The website for my motherboard states:

  • 1 x PCI Express 3.0 x16 slot (PCIE1: x16 mode)
  • 1 x PCI Express 2.0 x16 slot (PCIE2: x4 mode)
  • 2 x PCI slots
  • Supports AMD Quad CrossFireX™ and CrossFireX™

  • Since the second PCI Express slot is slower than the first slow, will this slow down the second card?

    Or - is my motherboard fine to use CrossFireX?
  • More about : worth 7870 tahiti pcie mode

    a b U Graphics card
    a c 79 V Motherboard
    December 24, 2013 1:45:16 AM

    no it wont....crossfire works in pci-e x4 without any issues.
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    a b U Graphics card
    a b V Motherboard
    December 24, 2013 1:49:32 AM

    Yes completely worth it....
    Here's review

    http://www.techpowerup.com/reviews/Intel/Ivy_Bridge_PCI...

    At higher resolutions the difference between the two slots is negligible.

    Also they say the difference is about only 2 percent for Gtx 680 and 4 percent for a 7970.

    So you don't have to worry. You can pair them up without a significant performance loss.
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    a b U Graphics card
    a c 79 V Motherboard
    December 24, 2013 2:45:17 AM

    it is also worth mentioning that some 7870 tahiti can pair with a 7900 series card (although not all)
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    !