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Cooling and Heat Issues with Air 740 case and Quad GTX 1070 GPU's

Hello all,

I have a cyber analysis workstation that I built from COTS hardware to analyze forensic data sets. Dual SLI on these MSI GTX 1070 Armor OC cards works within temp specs, but lacks performance needed. If I run four of these, they will rise well above temp limit of 65C to 90C in 5-10 minutes so I have to shut them down. GPU3 (aka 4 at the bottom) however remains unaffected, likely due to the bottom fan I thought would assist with upwards intake to upper fan for exhaust. The three front fans are intake in addition to the CPU cooler (as recommended). It's difficult to place the CPU cooler at the front due to controls on the main board (the standard buttons on the board and debug LED display are inaccessible by GPU3 aka 4 or bottom) and I don't think putting it at the top would help (as heat would rise into it).

As it stands now, I have noticed that if GPU0 (top) is activated with GPU3 (bottom), GPU3 remains within temp specs but GPU0 will begin to transfer heat to CPU above it (I noticed that CPU temps rise with GPU0). I really don't want to go water cooled on these, but will if I must. Most cyber forums where InfoSec pros did this used FE cards (which would exhaust from the PCI expansion slot instead of into the case (and surrounding cards). I thought the upwards motion of the bottom to the top, with the intake of the warmer CPU to cooler intake from the front, would result in a heat vortex rising from the top but clearly that isn't working. Note the bottom GPU temp, which is actually running at 90% remains quite cool. Am I doomed to the MSI Aero (FE type card) or Aero ITX perhaps better idea?

If anyone has any suggestions to check fans, the type or if you see a better thermodynamics that I could implement in the case - please feel free to suggest! Here's some images of the case from Spiceworks community below:





7 answers Last reply Best Answer
More about cooling heat issues air 740 case quad gtx 1070 gpu
  1. This is why you need a blower style card for air cooled multi GPU setups. Or you could go with water. There is not much else you can do.
  2. from picture 1 and 2 the back top fan does not spin and what happens if you stop the bottom fan it push air up but disturb the front flow see if you cpould made a plexiglas funnel from top of middle fan to bottom one to push air directly to the gpu section leaving top front for air to the cpu .
  3. scout_03 said:
    from picture 1 and 2 the back top fan does not spin and what happens if you stop the bottom fan it push air up but disturb the front flow see if you cpould made a plexiglas funnel from top of middle fan to bottom one to push air directly to the gpu section leaving top front for air to the cpu .


    No the top fan doesn't run, I don't have enough connectors on the board. Perhaps I should try the MSI Aero ITX versions (larger fan than the Aero FE style and still OC)? I was also thinking of reversing the CPU cooler to be exhaust as well (I don't like the idea of heat transfer to the CPU but it doesn't NEED to be OC and is known to run hot, which if on 4.2Ghz stock - may be perfectly fine). Another suggestion someone had was to perform a smoke test, and see where the air goes inside and out. I may also do a thermal test afterwards but I think Froggy may be right, I must go to blower style cards and get more cool air forced to the front of them. I'll try checking this at home but it will be this weekend before I receive blower style cards. -BT
  4. get a fan splitter to run both top ones on same connector and cpu fan should push air from from front ot fins at the back and the one on case side should pull hot air out .
  5. This will run hot no matter what you do.
    Either get blower cards or watercool them.
  6. Thanks all, I have two MSI GTX 1070 Aero ITX on the way. I looked into the Aero models themselves and personally noticed, that while I didn't like that they had no backplate (I don't require one with this board anyway), they were fairly sturdy and had OC. Additionally, the fan was larger and it appears that the spacing inside the heatsink was wider and more exposed that the Aero FE type card. I'm sure the Aero would look ideal, but then again - functionality is paramount.

    As an additional note, it seems my MSI Enthusiast Gaming Xpower Z270 Titanium is not as smart as I thought it was. MSI makes some really, really freaking awesome apps for these solutions. I noticed that in the MSI Command Center, the CPU fan was set to smart mode. I decided to turn this off just after firing up GPU0 (top) to determine if the CPU intake air rose just as much in proportion to the GPU. This is important, as these fans are about to become exhaust instead of intake so I need to know how cool it 'should' be on an i7-7700K. An astute observation here found that the CPU temp did rise about 20 degrees when turning on GPU0 but that engaging the CPU fans on the H80i to 75-100% and all other fans but the bottom at 50% - I was able to get GPU0 to become fairly stable while GPU3 was still running at the usual 55C. However, this resulted in temps of 70-75C depending on how much I wanted to drive the CPU fans.

    I suppose this is a start, but the case door is open :-\
  7. Best answer
    leave front fans as intake and top with back as exhaust aslo cpu fans in a 4 pins one so leave it to pwm for the gpu put them as dc fans in msi control center .
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