Crossfire ONLY in Windows?!

Discussion in 'Mac Pro' started by ixobelle, Jun 18, 2012.

  1. ixobelle macrumors newbie

    Jun 18, 2012
    From what I see (and I just want to make sure I'm not missing anything obvious), the only way to get the full potential of two video cards on a Mac Pro tower is to run Windows on it?

    I'm coming from the Windows world myself, so I really have no aversion to running Windows, but I just bought this Mac Pro tower (2x Quad Core 2.26, 14gb ram, 4870 512mb Radeon, full specs here) and went straight out and bought 2x 5770s on the cheap to chuck in here because I heard that 1x 5770 underperforms a single 4870, but two will do just fine.

    I run twin nvidia 460s in SLI on my Windows Rig, and just didn't even think twice that Mac Pros wouldn't be able to support this setup. I'm a little shocked, but want to ask the obvious, otherwise unasked question that comes to mind:

    Is there ANY benefit to running these two cards simultaneously if I won't be booting into Windows on this rig?

    Other than powering 6 screens or something silly? I have a single monitor on this Mac, but can Macs offload Physics processing or anything like how the nVidia setups can in SLI? Have one card dedicated to chugging out frames and the other solely thinking about ragdoll/particles, etc?

    Thanks all. Been trolling around here a bit since venturing into Mac land forreals, looks like a helpful place. :)
  2. derbothaus macrumors 601


    Jul 17, 2010
    No Crossfire/ SLI support in OS X. Never has been unfortunately. You may be able to bridge them for Win use and then use a single for OS X. Or get a 5870 instead as it is roughly 2 times as strong. Take a look at some of the unsupported cards posters have got going as well. GTX 570, AMD 6870, etc.
  3. ixobelle thread starter macrumors newbie

    Jun 18, 2012

    Well, thanks for the quick response. Looks like I got two cards to pawn.

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