You can view the Processor Settings screen by clicking System Setup Main Menu > System BIOS > Processor Settings . Choose 'Number of Cores per Processor" , the default is all , change to 4.  
I have procured 4 R630 poweredge servers with 1 Processor, 8 cores. Due to application license issue, I need to have only 4 cores enabled on the servers. Is there any possible way to disable itin BIOS level ? I know there is a way to do it on OS level, but I'm trying to find a way to disable it on BIOS level. Please help
Disable cores on the bios level