CrossFire or SLI on MacPro

Discussion in 'Mac Pro' started by hajime, Jul 4, 2008.

  1. macrumors 68000

    Joined:
    Jul 23, 2007
    #1
    In the PC world, most latest motherboards support either SLI or CrossFire. How about the MacPro's motherboard?
     
  2. macrumors P6

    Tallest Skil

    Joined:
    Aug 13, 2006
    Location:
    1 Geostationary Tower Plaza
    #2
    Nope. Well, CrossFire, yes, in Windows, and SLI with hacked drivers with the 7300 in Windows...

    Not OS X, though.
     
  3. macrumors 68000

    Joined:
    Jan 17, 2008
    Location:
    Philly
  4. macrumors member

    Joined:
    Jul 1, 2008
    #4
    He's kidding about the 280s.

    Anyway, SLI is supposed to only work on NVIDIA chipsets. A while back, though, they supported it on a few Intel workstation boards with Geforce 7-series. So, there are old drivers out there that will make the 7300s work on a Mac Pro in SLI, but it's only those old drivers with those old, wimpy cards.

    For ATI to compete, they allow Crossfire on an chipset, including the one found in the Mac Pro.

    Of course, both of these work only under Windows on a Mac Pro.
     
  5. thread starter macrumors 68000

    Joined:
    Jul 23, 2007
    #5
    Thanks for the info. So, I can install two ATI HD 4870 and crossfire them. If I choose the Nvidia 260GTX or 280GTX, I can only use one card. Am I right?
     
  6. macrumors P6

    Tallest Skil

    Joined:
    Aug 13, 2006
    Location:
    1 Geostationary Tower Plaza
    #6
    Pretty much so, yeah. Well... There isn't enough power for two 4870s. You need two cards with only one external power connector each.
     
  7. macrumors G5

    Sun Baked

    Joined:
    May 19, 2002
    #7
    Apple decided not to use the chips for the Intel D5400XS board, which would have had onboard support for both in HW.

    I guess if you really want that support, a hackintosh skulltrail board might fit.
     
  8. macrumors member

    Joined:
    Jul 1, 2008
    #8
    The Skulltrail motherboard achieves SLI by including 2 NVIDIA MCPs. It'd be kind of silly for Apple to have included these just for Windows.
     
  9. macrumors G5

    Sun Baked

    Joined:
    May 19, 2002
    #9
    Who said just for windows? People want OS X support for SLI and crossfire.
     
  10. macrumors 68000

    Joined:
    Jan 17, 2008
    Location:
    Philly
    #10
    then we could play C&C3 and Halo. great.

    it would be nice, but if you want to actually have fun playing, you use Windows.

    Also since SLI and Crossfire mileages vary from game to game and driver to driver, it's safer to have one powerful card instead of two, unless you have an XHD monitor, which few people use because cards have a lot of trouble rendering that much, so you don't get playable frame rates.
     
  11. macrumors 601

    Umbongo

    Joined:
    Sep 14, 2006
    Location:
    England
    #11
    It's a very small minority though which is why it will probably remain unsupported by Apple.
     
  12. macrumors member

    Joined:
    Feb 27, 2005
    #12
    I have seen benchmarks of a 2008 mac pro running with two 2600xt graphic cards and being able to utilize them in crossfire, it worked in about 5 out of 6 games with Crysis being the odd one out, all of the other games COD4 UT3 and forgot the others showed a near doubling of the frames per second, so would imagine 2 x 3870's should function similarly.
     
  13. macrumors G4

    Lord Blackadder

    Joined:
    May 7, 2004
    Location:
    Sod off
    #13
    Someday Apple and ATI/NVIDIA will support CrossFire/SLI in the Mac Pro, but it won't be soon (I'd be happy to be proven wrong, of course).

    Even if Apple chose a chipset that supported SLI (and even though CrossFire doesn't need it), they'd still need to do all the driver work - and as the PC world has demonstrated getting two cards to work together can be tricky. Apple would have the luxury of coding drivers designed to work on just one motherboard/chipset though, so that would be an advantage.

    CrossFire/SLI is an attractive proposition for OS X users because video card releases don't happen often, so anything that can be used to increase GPU performance is desirable.

    I'm not holding my breath though.
     
  14. Guest

    Joined:
    Jan 28, 2008
    #14
    Be thankful that CrossFire works in Windows on the Mac Pro at least...
     
  15. macrumors G4

    Lord Blackadder

    Joined:
    May 7, 2004
    Location:
    Sod off
    #15
    In spite of Apple and ATI, unfortunately.
     
  16. macrumors 68040

    Bubba Satori

    Joined:
    Feb 15, 2008
    Location:
    B'ham
    #16
    No, you don't need it. No no no. No Blu-ray. You don't need it. No no no. No full selection of the latest generation video cards available. You don't need them. No no no. No updated ACDs. You don't need them. No no no. :D
     

Share This Page