Upgrading my GPU



It's more than "marginally" faster, the 720 scored 896 in the PassMark video test, 750Ti got 3676

That is 4 times the score, a pretty big difference. Maybe a 750 to 750 Ti wold be a close call but a 720 to a 750 Ti is well worth it.

It will work just fine in that computer, it's actually a very nice looking case coming from a OEM maker like Lenovo.
 


You definitely could.