If my drivers are old, can SI Client show me that?
Yes, SI Client will offer you notifications and news about updated drivers. It has its own database of drivers and if it finds drivers after your computer has been scanned, then you will receive notifications that your drivers need update.
You do not need SI to do this (I do not). You can have your computer automatically check, obviously be connected to the internet when you do this. You also have to be an admin. Start → Control Panel → Hardware and Sound → Device Manager