fans run at high-speed over-cooling CPU

we have two identical server R220, except one with E3-1220 and other with E-1230. I am trying to run them with very low power and noise, so I've disabled turbo-mode and hyper-threading on E3-1230, thus making it very similar to E3-1220.

But... here is CPU temp and fans speed on one server

ID | Name             | Type                     | Reading    | Units | Event
7  | Sys Fan1         | Fan                      | 3480.00    | RPM   | 'OK'
8  | Sys Fan2         | Fan                      | 3480.00    | RPM   | 'OK'
9  | Sys Fan3         | Fan                      | 3360.00    | RPM   | 'OK'
10 | Inlet Temp       | Temperature              | 26.00      | C     | 'OK'
72 | Temp             | Temperature              | 36.00      | C     | 'OK'

and here is on another

7  | Sys Fan1         | Fan                      | 8640.00    | RPM   | 'OK'
8  | Sys Fan2         | Fan                      | 8880.00    | RPM   | 'OK'
9  | Sys Fan3         | Fan                      | 3120.00    | RPM   | 'OK'
10 | Inlet Temp       | Temperature              | 23.00      | C     | 'OK'
72 | Temp             | Temperature              | 28.00      | C     | 'OK'

I've tried all possible ways to bring Temp to 30+C so the fans will run at 3K: updated BIOS, iDRAC, replaced fans, replaced MB too. Apparently this MB does not have chip for OS to regulate fans speed.

Any insight and recommendation are appreciated

Thanks