What is the optimal case fan placement for the Corsair 600c?

Apr 1, 2018
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This is my current setup https://imgur.com/a/YrH0S

Idle I get GPU temps of 45C and under load I got 78C

I'm going to try the opposite setup and see how it does.

After flipping all 5 fans, I have found that temperatures have dropped about 2-3 degrees Celsius idle and under load. I still feel this could be optimized