What kind if output do you use to monitor the rpm? mobo fan power connectors ok?
i think any mobo fan connector would be ok, didn't try it though. i just use scythe kaze panel, see ~3900rpm from my ddc1-t. also this panel has a loud beep alarm if rpm goes to 0.
just wonder, how much heat both pumps generate. for example, i stopped all fans (mobo was unplugged) and temp increased at 3C above ambient. this is with 1liter of water in the loop.