PC 7950 8 pin power

Discussion in 'Mac Pro' started by GP-SE, Mar 28, 2013.

  1. GP-SE macrumors 6502

    Joined:
    Feb 27, 2013
    #1
    Hey guys, just got a brand new AMD HD 7950 (direct from AMD!)
    but it has a 6 pin power and 8 pin power.
    What options do I have?
    1)buy a 6 to 8 pin adapter
    2)plug both 6 pin connectors in, leaving the 2 empty pins?

    I have a 2009 Mac Pro.
     
  2. bsbeamer macrumors 6502

    Joined:
    Sep 19, 2012
    #2
    external PSU I believe is best recommended option... some people have used the 8 > 6 pin adapters, but there's concern it could fry the motherboard.
     
  3. GP-SE thread starter macrumors 6502

    Joined:
    Feb 27, 2013
    #3
    thanks for the reply, I searched online, the last two pins are used as grounds. I'm going to buy a 6 to 8 pin adapter and try that first, I really don't want to buy an external PSU.
     
  4. Killerbob macrumors 6502a

    Joined:
    Jan 25, 2008
    #4
  5. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #5
    You are probably safe with an adapter, but I'd just return it and get a 7950 with 2x6-pin, as there are plenty of those that are probably better than the AMD direct one anyway.

    The Gigabyte 7950 has two 6-pin power inputs, runs quiet with three large slow fans, and is factory overclocked so runs slightly faster than baseline cards.
     
  6. GP-SE thread starter macrumors 6502

    Joined:
    Feb 27, 2013
    #6
    I got the adapter, everything is working great!
    Looking at reviews for power consumption it draws as much power as the stock Apple 4870, so I'm not to worried.
     
  7. BigJohno macrumors 65816

    Joined:
    Jan 1, 2007
    Location:
    San Francisco
    #7
    I have yet to see someone complain on here of frying their MB from a 6 to 8 pin connector. There is a thread around here ruling out that myth.
     
  8. handheldgames macrumors 6502a

    handheldgames

    Joined:
    Apr 4, 2009
    #8
    Suggestion: return it and get one with 2x6pin connectors. The MacPro PSU runs them without a problem.

    :p
     
  9. GP-SE thread starter macrumors 6502

    Joined:
    Feb 27, 2013
    #9
    returning isn't an option because I got it from a friend of a friend who works at ATi\AMD here in Ontario.
    So far running with the adapter hasn't caused any issues, and from google searches it doesn't appear to be an issue using a 8 pin adapter.
     
  10. cal6n macrumors 68000

    cal6n

    Joined:
    Jul 25, 2004
    Location:
    Gloucester, UK
    #10
    If you want to monitor the power draw of the PCI slots and feeds, you can use Hardware Monitor.
     
  11. BConvery macrumors regular

    Joined:
    Feb 28, 2009
    #11
    The Gigabyte 7950 I got today has one 6 and one 8 pin connector. Going to try the adapter.
     
  12. GP-SE thread starter macrumors 6502

    Joined:
    Feb 27, 2013
    #12
    I've been using the adapter for almost two weeks now, not a single issue, I've been playing tons of BioShock too!
     
  13. BConvery macrumors regular

    Joined:
    Feb 28, 2009
    #13
    Running the 6 to 8 pin connector. I get the occasional panic or freeze if it sits for a while. I was underwhelmed with the performance increase (I think I was expecting amazing fps) from my flashed 4870 1G so I'm prolly sending it back.
    :(
     

Share This Page