What’s the goal? Are you unsatisfied with current noise levels or temperatures? What’s currently the loudest component (cpu cooler, gpu cooler, or case fans)? What cpu are you running? Where is the 140mm fan positioned? Have you already configured custom case fan curves and/or gpu fan curves?
Given how that case is setup and a normal tower cooler, you’ll see most temperature reductions from one additional fan. The 140mm intake is shipped so it’s at the top of the case, in line with the CPU cooler. Adding another fan to align with a GPU can help lower gpu temperatures and/or reduce gpu cooler noise, but it does mean more noise from the additional fan.
If your CPU isn’t too hot, you may benefit from moving the 140mm intake down to feed the gpu cooler and let the cpu fend for itself. This is what I’m currently doing in my case (fractal r6) where I have the bottom and bottom front fan slots populated, but no top front fan to blow directly at my cpu cooler (Mugen 5 on lightly overclocked 8700k). My GPU fans are the loudest component at load anyway, and my cpu cooler stays well below that noise threshold with acceptable temperatures. .
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