how much can i upgrade
I have a MacBook5,2, currently running OS 10.6.8. To what system can I upgrade?
MacBook, Mac OS X (10.6.8), 6 gb ram
You may be able to upgrade to El Capitan v10.11 > Upgrade to OS X El Capitan - Apple
Very important to read this user tip prior to upgrading from Snow Leoaprd > Upgrading to 10.7 and above, don't forget Rosetta! | Apple Support Communities
If you do decide upgrade the system, make sure to backup all your important data first.