I have a mac desk top OS X version 10.6.8

How far will depend upon the specifications of your computer.

Get more information about your computer. Go to the Apple in the upper left corner of any window, then "About This Mac". Write down, or highlight and copy, what it says about "version"and report that here. Now continue to "More Info..." Copy and paste the information here, but omit the serial number and Hardware UUID (if present).

For any version it is advisable to use Software Update at least once so you get special updates such as the "Mac App Store Update for OS X Snow Leopard" - https://support.apple.com/HT205702