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It seems like from your test set up the GPU isn't ventilated. If negative pressure decreases GPU temperature it seems like the positive pressure is causing the warm cpu exhaust to be dumped around the GPU.I think you should make sure the configuration is close to the current design in terms of ventilation and chambering. It seems like the GPU isn't ventilated and I feel of there is more ventilation in front of the case the warm cpu air can properly exhaust.
It seems like from your test set up the GPU isn't ventilated. If negative pressure decreases GPU temperature it seems like the positive pressure is causing the warm cpu exhaust to be dumped around the GPU.
I think you should make sure the configuration is close to the current design in terms of ventilation and chambering. It seems like the GPU isn't ventilated and I feel of there is more ventilation in front of the case the warm cpu air can properly exhaust.
