Stepping G0 reduces power consumption during C1E halt states. Intel does not state how much less power stepping G0 processors consume in idle states except “some amount.” Intel improves VT technology in stepping G0.
The enhancements include:
All stepping G0 processors will receive new CPUIDs. The Clovertown CPUID will change from 06F7 to 06FB while Woodcrest changes from 06F6 to 06FB. Stepping G0 processors will also receive new SSPEC numbers.
APIC Task Priority Register (TPR) Virtualization NMI-window exiting Advanced VM-exit information for INS & OUTS
The new G0 stepping only requires a BIOS update to work properly.