jacoro1 Posted October 23, 2014 Share Posted October 23, 2014 Hello- I recently installed an H90 cooler and connected the pump to the CPU fan socket on my motherboard (ASUS Rampage V). Fan monitoring in BIOS was reporting it as running at around 1200 RPM. This seemed a little low as the H80i I have in a different machine runs around 2200RPM. I changed the CPU fan setting from "PWM" to "DC" in BIOS fan control, and the RPM went to 1500 but emits kind of a gravelly hum at that speed. If I enable PWM again and drop the speed slightly the hum goes away and it doesn't seem to impact temperature. My questions are: 1. What is the max speed of this pump supposed to be? Is 1500RPM normal or should I be concerned? 2. Is it ok to run the pump at variable speeds? I have read elsewhere that it is supposed to be constant. I would really rather run at the slightly reduced RPM where it is silent, but don't want to kill my pump. Thanks Link to comment Share on other sites More sharing options...
Corsair Employee Corsair Dustin Posted October 27, 2014 Corsair Employee Share Posted October 27, 2014 Disable the fan control on the pump entirely. It's not meant to run at variable speed. Link to comment Share on other sites More sharing options...
Latharion Posted October 30, 2014 Share Posted October 30, 2014 Also around 2200 RPM is the normal constant speed of the pump. It can fluctuate a bit, but defintely not down to 1500 RPM. Link to comment Share on other sites More sharing options...
Suppressor Posted January 23, 2015 Share Posted January 23, 2015 Also around 2200 RPM is the normal constant speed of the pump. It can fluctuate a bit, but defintely not down to 1500 RPM. I tried connecting my pump to all connectors on the MB and they are all set to Full speed but I'm still seeing 1500rpm from the Pump on the BIOS and all apps that can monitor that kind of info. Are you sure the H90 pump is supposed to run at 2200rpm and not 1500? thanks. Link to comment Share on other sites More sharing options...
Corsair Employee Corsair Dustin Posted January 26, 2015 Corsair Employee Share Posted January 26, 2015 So my workstation here at Corsair uses an H90 and I went to check the pump RPM. The pump RPM was 900, which is definitely too low. So thanks to this thread, I caught a personal oversight. ;) The correct pump speed for the H90 is ~1500rpm. Link to comment Share on other sites More sharing options...
Suppressor Posted January 28, 2015 Share Posted January 28, 2015 So my workstation here at Corsair uses an H90 and I went to check the pump RPM. The pump RPM was 900, which is definitely too low. So thanks to this thread, I caught a personal oversight. ;) The correct pump speed for the H90 is ~1500rpm. Thank you! I can now rest in peace :P Link to comment Share on other sites More sharing options...
mattlach Posted July 25, 2016 Share Posted July 25, 2016 Thanks, This thread helped me verify that my stepsons system was running properly. Thank you! I can now rest in peace :P Please don't die! :P Link to comment Share on other sites More sharing options...
DivineWrath Posted March 12, 2017 Share Posted March 12, 2017 Glad I found this my pump was at 900rpm so I adjusted the curve to always have the pump at 1500rpm. Link to comment Share on other sites More sharing options...
c-attack Posted March 12, 2017 Share Posted March 12, 2017 Yes, classic 60% default preset for a DC fan/motor. You'll need to set the BIOS fan control for that header to 100%/PWM/Disabled each time you update or flash the BIOS. Link to comment Share on other sites More sharing options...
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