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The GPU has a direct intake on the side of the case, there are also vents on the bottom and front of the prototype. Admittedly, yes the top panel does not have any vents that the final product will have. But, the EVGA GTX 960 blows most of its warm air out the front and rear due to its shroud design.The photo below is a view from the other side of the prototype:Please bare in mind that the results where the GPU is running at 1400rpm is actually still a very low speed considering the entire system is being stressed, the fan can go up to something like 3000rpm. The GPU temperature stay well within its 80C target with plenty of headroom before it starts throttling.My theory on why the positive pressure effects the GPU temperature is due to how the air pressure affects the GPU fan performance, this is because the positive pressure is acting against the GPU intake fan so it has to work harder to pull in the same amount of air and maintain its sub 80C temperature. The opposite is observed when under negative pressure in that the negative pressure is assisting the GPU fan pull air into the case and therefore it doesn't need to work as hard to maintain the sub 80C GPU temp.Imagine a plane flying into the wind, it will travel slower, and the opposite if the plane fys with the wind.
The GPU has a direct intake on the side of the case, there are also vents on the bottom and front of the prototype. Admittedly, yes the top panel does not have any vents that the final product will have. But, the EVGA GTX 960 blows most of its warm air out the front and rear due to its shroud design.
The photo below is a view from the other side of the prototype:
Please bare in mind that the results where the GPU is running at 1400rpm is actually still a very low speed considering the entire system is being stressed, the fan can go up to something like 3000rpm. The GPU temperature stay well within its 80C target with plenty of headroom before it starts throttling.
My theory on why the positive pressure effects the GPU temperature is due to how the air pressure affects the GPU fan performance, this is because the positive pressure is acting against the GPU intake fan so it has to work harder to pull in the same amount of air and maintain its sub 80C temperature. The opposite is observed when under negative pressure in that the negative pressure is assisting the GPU fan pull air into the case and therefore it doesn't need to work as hard to maintain the sub 80C GPU temp.
Imagine a plane flying into the wind, it will travel slower, and the opposite if the plane fys with the wind.
