Successful 7970 Install, LuxMark Tested

Discussion in 'Mac Pro' started by MacMilligan, Jul 31, 2013.

  1. MacMilligan macrumors 6502

    Joined:
    Aug 2, 2012
    #1
    I purchased a GTX760 to use in my Mac Pro. I have a 7970 that I was going to use in a small form factor build, but it was a tad too long. The GTX760 fit perfectly, so I decided to see if the 7970 would work with the Mac Pro and do a little testing to see if it would be fine for the long haul.

    I plugged the card in using two PCI extenders I found on eBay and used a 6-pin to 8-pin adapter that came with the GTX760. I know the TDP of a standard 7970 is 250W, just over the 225W limitation of the 2x6Pin connectors. The 7970 isn't nearly as power hungry as a GTX580, so I'm not too worried about it especially since I hardly use it "maxed out."

    I fired the Mac Pro up and waited through the black screen. I got to the login screen in about 10-15s without issue.

    [​IMG]

    It read the 7970 just fine, comes up as a 7xxx series card. Then I ran LuxMark Room. My previous Nvidia GT640 ran a 77 on the room, so I was betting this would do a little better... well...

    [​IMG]

    Now that's fast. I'll keep reporting back with issues and such if they crop up. I'm curious to see how Photoshop handles the hardware. The expansion slot fan acted up a bit at first, but it is running smoothly at 800RPM now. The GPU temps are incorrect, heat monitor is reporting 85C at all times which is obviously not right. Maybe an SMC reset will fix it or it may just be an artifact of the beta drivers. Hopefully we see even better support as we approach the Mac Pro refresh.

    Lastly, the power usage doesn't seem too bad at all. I have a UPS that reports wattage. At idle the Mac Pro uses 138W (with one 27" monitor also plugged into the UPS, so subtract about 30-40W from that.) At full load during GPU Luxmark the peak power pulled was 299W. That means the 7970 was pulling 161W + ~15W idle = 176W total GPU load under luxmark. Of course "power virus" programs like Furmark could increase that substantially, but I never use those programs.

    Hope that helps some people that may want to use AMD cards. Let me know if you want me to test any apps or benchmarks.
     
  2. flowrider macrumors 601

    flowrider

    Joined:
    Nov 23, 2012
    #2
    That is lightening fast, but not totally unexpected for the new Radeon 7900 series of cards. Bear Feats just tested some GPUs, and the R7950, Mac Edition did very well in that test:

    My flashed upclocked GTX570 only does 461.

    http://www.barefeats.com/gpuup.html

    Lou
     

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  3. snarfquest macrumors regular

    Joined:
    Jun 7, 2013
    #3
    MacPro 3,1 with 7970

    Interesting :) First time I've run this test.
     

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  4. MacMilligan thread starter macrumors 6502

    Joined:
    Aug 2, 2012
    #4
    Yup, the 7xxx series whips the nvidia cards in openCL :)
     
  5. Jani81 macrumors member

    Joined:
    Feb 12, 2013
    Location:
    Finland
    #5
    I don't know how but i got better result with my sapphire radeon 7950 mac edition?
     

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  6. pastrychef macrumors 601

    pastrychef

    Joined:
    Sep 15, 2006
    Location:
    New York City, NY
    #6
    Wow. 7950 is exactly twice as fast as my GTX 680.
     
  7. 666sheep macrumors 68040

    666sheep

    Joined:
    Dec 7, 2009
    Location:
    Poland
    #7
    You've used different scene. Use room if you want to compare score with OP's card.

    Don't worry, only in Luxmark. Its code is highly optimized for AMD 7xxx series.
     
  8. Jani81 macrumors member

    Joined:
    Feb 12, 2013
    Location:
    Finland
    #8
    Yes you were right. Here's the result with same scene.
     

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  9. MacMilligan thread starter macrumors 6502

    Joined:
    Aug 2, 2012
    #9
    I wanted to update everyone on the 7970. I've had 2 kernel panics due to the AMDRadeonAccelerator since I installed this card and loud fan noises when the computer sleeps. I would recommend not using the 7xxx series in a workstation at this time. Hopefully driver support is better with Mavericks. I've moved back to an Nvidia card for the time being.
     

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