How can I check which SMC version I am 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.