Thanks for your input.
Ok the comparison between the TX2540 and TX140 is not fair, but compared to a HP DL380 with relative same specs is fair, and the HP is also almost silent, except when under heavy load or reading from the disks it generates noise, but not the same fan noise as the TX2540.
Here is the fan speed from IRMC
And the temp.
Don't know how it's supposed to look on a Fujitsu server, is this correct or ?
By the way, the only noise i hear when doing the FAN test is from the fan in the PSU, it spins up really fast, but the other fans, don't seem to change.