There is no way to adjust fan speed, but updating the ESM is likely to improve cooling efficiency, which will likely quiet the fans a little. Fastest way without an OS: Download SBUU and SUU, boot to SBUU, select Firmware Update, insert SUU when prompted for an update repository. SBUU (Server Build and Update Utility): SUU (Server Update Utility):[URL] Another way is to use Repository Manager.  Because the two utilities above are so large (both support every server from 9th generation until current (12G) and SUU requires a DL-DVD), you can use RM to create a custom repository, including only the systems you need, then compile those updates (use linux packages only) into a bootable ISO ... boot to that disc and the updates run automatically. Repository Manager (create a source, then a repository, then export it as a bootable ISO):[URL]  
I'm using this PE 2950 as an ESXi host currently.  I'm pretty sure this thing is running BIOS v1.2.0.  I'd like to update both the BIOS and the EMS.What would be the best and easiest way to perform these updates?  Are there any other recommended drivers/firmwares I should look in to for it?  Again, this is an ESXi host, it's not running an OS.Also, a bit off topic, but is there a way to adjust fan speed?
Best/easiest way to update BIOS on 2950 Revision II?