So I have standard 3pin fans 12v fans and controll speed trough mobo. Is it safe to run it on 6v because the temps are still good. cpu around 50-55 celsius and every thing is okay but my question is it safe to change it if its original 12v fan? The fans are fractal design silent series white 120mm 2x in front and rear silentiumpc zephyr 120mm blue led. The fractal runs 700-800rpm and pretty much the same for that silentium fan. Can you tell me how many voltage do you use for your fans to be good quiet/performance ratio? Thx for your help.