I guess there are some users with ASUS, Asrock and MSI mainboards who haven't patched their BIOS like me and therefore need a patched version of AppleIntelCPUPowerManagement.kext for 10.8. Here you are!
Mieze
using stock 2103 bios dsdt from database with added pstates from stock 4.6.1 i5 SSDT. i get native speed stepping. 16 to 20, and 34 using this modified kext.