That depends on what the mobo maker has done with the BIOS, like the poster above you said, but generally they improve stability &/or add features however in rare cases they may disable a setting or two again depending on the issue of stability. So mostly its adding compatibility for future/current gen CPU's & increasing stability with the latter always being a priority !are you sure? coz i remember reading somewhere that since its the BIOS that controls low level stuff like moving data within the RAM, newer versions COULD have a slight performance increase.