Providing that IMVHO none of the actual parts seems "silent" (I mean, CPU, PSU, VGA, et caetera), to answer your question, IMO: both the Nexus on the Hyper heatsink, the two Noctuas as front intakes, the BeQuiet as rear exhaust; run them at no more than 8-900rpm on load, but I bet 5-600rpm would even suffice, while at idle keep them as low as your headers can drive them.
Thank you for your reply!
I agree with you that this is not a true "silent" build. I¨m merely trying to reduce soundlevels as much as possible on what I have since i cant even afford to buy better fans atm.
Much less to buy beter hardware and go full passive witch would be the dream...
That said, the same fans, heatsink and psu only ever rose above ambient roomlevel in my old chassis with a 125W TDP CPU and onboard graphics when CPU was at 100% load.
I will definitely use the Silent Wings as exhaust as per your suggestion, it seems reasonable since that should be the most exposed placing, and it seems to be the best one from what i can find on this site.
The Heatsink setup you suggest is the one i have now, But i will replace that with a BeQuiet! Dark Rock Pro 3 bundled with two Silent Wings 2 fans that i recently won in a competition along with the third Silent Wings fan (the one available as case fan).
This will free up the two Nexus fans as case fans,
So given that, do you think i should go with Noctua or Nexus in the front? Noctua has higer cfm but are louder from what i can see, but maybe static pressure comes in play with the harddrive cages just 1-2 cm behind? I belive Nexus is better then?