I have ordered two more blue ducts and a third Noctua NH-12P fan to experiment more on this approach :-) for now, the Scythe remains on the exhaust, and since it has a slower speed compared to the Noctuas the PSU gets warm, but next week it'll get solved :-).
Oh, some little circuits I made to...
I have some plastic sheets I could cut to make some sort of "air channel" similar to those you find on high-end workstations and servers, but they're black so they'd cover up all the "machinery" :D and since I have the transparent side panel that wouldn't be cool (I ain't an extreme modder but a...
Some homemade ducted PWM cooling system for my Nehalem-EP workstation :) it may be not that good and not ultra-tailor made but it works somewhat good preventing PSU from taking in the CPU0 heat. Setting 30% min RPM (560 RPM) yields 45°C (113°F) idle temp, 45% (780 RPM) takes that down to 42°C...