MP 5,1 PCIe temperatures go up with two monitors

Discussion in 'Mac Pro' started by Raunien, Mar 23, 2015.

  1. Raunien macrumors 6502

    Aug 3, 2011
    Hi all,

    When I have two monitors plugged into my 5770, the PCIe slot 1 temperature goes up dramatically to like 70degrees celcius. Is this normal?

    When I have only one monitor plugged in, it stays cool at around 50-55 C.

    What are your guys' experience?
  2. Peace macrumors Core


    Apr 1, 2005
    Space--The ONLY Frontier
    Mine goes up to about 70 all the time when I'm playing World of Warcraft.
  3. Macsonic macrumors 65816


    Sep 6, 2009
    It's normal as the GPU uses more energy to power up 2 monitors, specially if the monitors are 30". I have a Radeon 5770 and under heavy load can get hot even though it's TDP is low.
  4. Raunien thread starter macrumors 6502

    Aug 3, 2011
    Alright, that makes sense. I just wanted to make sure I wasn't going to fry my Pci slot.
  5. omvs macrumors 6502

    May 15, 2011
    I'm not convinced it takes significantly more graphics power to drive two monitors. However, I did notice a similar situation on my 2011 imac - the idle power jumped >significantly when i hooked in a second display, and iStat Menus showed it was all gpu power.

    My theory is the graphics driver disables some of the power saving measures when more than one monitor is hooked up.

    You won't fry your pci slot though - 70deg is fine.
  6. Raunien thread starter macrumors 6502

    Aug 3, 2011
    Quick-follow up: If I want to cool down the GPU, do I adjust the expansion slot fan speed or booster fan speed in iStat menus?
  7. omvs macrumors 6502

    May 15, 2011
    I'd try the expansion slot fan first - its right at the end of the card, so it should pull in more cool air if you crank it up a bit higher...
  8. Pressure macrumors 68040


    May 30, 2006
    It is only recently AMD and NVIDIA have implemented power saving features with multiple monitors attached.

    Meaning idle power draw with a multi monitor setup will be higher than with a single monitor on older cards.

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