HP Proliant DL380 G4 - Fans and Bios

I've just recently acquired a HP Proliant DL380 G4 second hand and experiencing very loud fans. I've read through just about every thread regarding this issue and have tried everything. I've installed every driver possible, every support pack available etc. (Under Windows Server 2008 x64)

The only difference that's I've managed to achieve is after installing the support packs the fans just run at fall speed, instead of a (guess) 60-70% speed.

I haven't been able to update the bios as I obtained the server secondhand and thefore do not have entitlement rights to download the most recent bios. I've also not been able to find anything within the bios or the management software regarding enviorment or fan management which I have seen mentioned in a few threads with the same issue.

I can't believe the fans are operating at their quiest setting currently. The ambient temperature is between 10 Celsius and 15 Celsius, so it's definitely not in a hot environment.

Many thanks,