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Hi, i wanted to silence my Pentium g4560 (no OC, 54W TDP), so i bought a H45 and connected the pump to pwm. I replaced the fan with a cheap coolermaster spinning at around 600rpm, so i can't hear the fans it in a totally silent room 50cm away from my pc at my desk. But the Pump of the H45 makes a really "loud" drone noise, like a vibrating dvd burner on a wooden table, but a bit quieter. It goes near silent if i clock the reported 4500rpm to around 3k-3,5k rpm at my bios. Temps are with stockfan H45 and new fan on H45 at full RPM around 40° C at prime tests, and around 46° C with intel boxed fan. Idle temps in all setups around 30° C, with nearly 30° C inside case and 27° C room temp, so the H45 has to cool very little heat away. Because the H45 have a separate connector with only the pump connected (i think, or is there any chipset/board inside?) and no LED, USB or anything, and the fan(s) on separate connections: Is it safe (for the H45, not the CPU or other components) to powerdown the pump to round about 60-70% of the speed it gets on 12V? Does it increase wearing-out in a very high level (destroying pump in way less than 24 months)? Or is all that talk about "stay on 12V ever!" only for the other Corsair Hydro AIOs with a lot more compenents on pump-power-cable, like usb, led-lights, controlling board? If not, do you know if that loud sound is a valid RMA reason in germany?
