Considering 980ti SLI in MP 4.1 = too much heat?

Discussion in 'Mac Pro' started by Norbert Mikołajczyk, Feb 7, 2017.

  1. Norbert Mikołajczyk macrumors regular

    Norbert Mikołajczyk

    May 26, 2016

    I'm wondering if it's a good thing in term of internal heat to put two 980ti in Mac Pro case?
    I read on this forum that 980ti seems to be very hot...
    I'm considering 980ti with enhanced cooling system (ACX 2.0+), like this model:
    I have internal PSU, right now I have 2x 680 in SLI and everything works great :)

  2. Synchro3 macrumors 68000


    Jan 12, 2014
    The card in your link has open dual fan design, not good for a Mac Pro. Prefer reference blower design, and you will have no issues with heat.

    P.S.: Avoid all 'classified' cards with 2 * 8 pin, if you want to use it in a Mac Pro.
  3. deppest macrumors member

    Oct 6, 2009
    I am running an EVGA 980ti ACX 2.0 in a 4,1 along with a maxwell titan x (blower) using slots 1and 3, powered by pixlas mod. No heat problem with open fan design nor blower design. Fans do spin up of course when rendering, but the Macpro manages well.
  4. h9826790 macrumors G5


    Apr 3, 2014
    Hong Kong
    The PCIe ambient temperature may go up a lot if you use the open fan type card, the hot air will be a bit hard to get out because there is no proper exit for the PCIe compartment. However, I don't think it can really cause any issue. The 980Ti rarely killed by heat. Its fan can spin up a bit more, and thermal throttled if really too hot.

    Also, the hot air can't stay, the PCIe fan still keep pulling cool air in, eventually the warm air either "leak" out, or exhaust by the PSU, or pulled out by the exhaust fan, until the PCIe ambient reach the new equilibrium temperature.

    If noise is not a big issue, I believe blower type reference card should be the good choice. PCIe ambient will still go up a bit, but much less than by the open fan type card, and the airflow is very straight forward to follow the Mac Pro's design.
  5. Norbert Mikołajczyk thread starter macrumors regular

    Norbert Mikołajczyk

    May 26, 2016
    thanks guys! I think I will go with the blower version, it sounds very reasonable :)

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4 February 7, 2017