Quote Originally Posted by ubi View Post
What is the difference between the watertemps?
there is NO DIFFERENCE at all! let my system idle for some time to stabilize temps a bit. fans on the radiator were running at 700rpm during both tests.
  • first i run the pump in ddc1 mode (3900rpm) for 10 minutes. core temp reads 29c for both cores. watertemp was 26.9c.
  • next i switched to ddc2 mode (4500rpm) for 10 minutes again. coretemp and watertemp stayed the same.

as said before, i have a very low flowrate and the change from 1.8liter/minute to 2.25liter/minute does not make any difference. may be if you are using a less restrictive loop and your flowrate would change form 3l/m up to about 4l/m you could see a difference.
in my environment, the limited change in flowrate has no effect on temps!
also, did this test during idle, because during orhtos, temps are fluctuating by some degrees which would give misleading results. if i see no difference during idle i doubt there would be any difference during load conditions at all.

the impact of fanspeed is far higher than the impact of flowrate:
running the pump in ddc1 mode again, i switched the fans on my radiator from 700rpm to 900rpm. i could watch temps going down: starting from coretemp readings of 29c and a watertemp of 26.8c, temps dropped to 28c in coretemp and 26.1c for water after 10 minutes. after witching back to a fanspeed of 700rpm, watertemp started rising slowly again ...