SSD drive into 2008 Mac Pro?

I have been using a 2008 Mac Pro (since 2008, in fact) - it still works, but it takes forever to boot, and is somewhat buggy - though works overall very well for an eight-year old machine. (I refurb-ed some of it about four years ago with a new graphics card, DVD rom drive etc.)

I have been advised that I can possibly get the machine to work at least slightly faster by putting the system on an SSD drive and using that as the startup drive.

Does anyone have any suggestions? I'm not sure...

SSD drive into 2008 Mac Pro?