Server CPU and Case Fans are very LOUD

Hi

Have just setup an intel server which has a Intel S2600CP4 SSI Motherboard and a Intel P4308XXMHEN server case and the CPU fan sounds like it a rocket as do the 2 standard case fans.

I have tried making changes in the BIOS to the FAN settings but doesn't seem to make a difference.

I have also updated the BIOS to the latest version but doesn't help either.

Have checked the case FANs are running at:

3402rpm and 4720rpm.

Any ideas on how to fix this would be great as is a big problem.