How can I check which SMC version I am using? I formatted my hard driver and reinstalled ML. I'd like to know whether I need to reinstall the latest SMC update or that once I install it is saved forever on the system.

I think that I don't need to reinstall it, because power sleep is enabled, and if I'm not mistaken it updates this feature, am I wrong?

In other words: Can I check which SMC I'm using?
Yes. To check which SMC you're using just:


From the Apple () menu, choose About This Mac.
Click More Info.
Click System Report.
Open the Hardware section to reveal Model Identifier, Boot ROM version, and SMC version numbers.


Just so that you know, if you are unsure whether your computer needs a particular update, simply download and open the update installer. The installer will alert you if the firmware update is already installed or not needed.