The AGESA is some code used by AMD for running multiple cores I believe. I am sure absic will correct me if I am wrong.
This is partially correct. AGESA stands for "
AMD Generic Encapsulated Software Architecture" and this software is responsible for the Initialization of the processor cores, along with Memory and HyperTransport Controller.
There is a new bios version and it says "Support new AMD SB850 version"
Doesnt it already have support for sb850 since thats the chipset of its southbridge?
Yes it does already have that but the update could well be to the SB850 Firmware.