My GTX 770 gets a graphics score of 8766 on firestrike. This stock GTX 970 gets a score of 11739. SO its more of a 30% difference between the two cards. Personally, if you are getting good FPS and are happy with how your games are running, then tehre is no reason to upgrade the GPU! GTX 770s are still awesome cards, and you can overclock a fair bit aswell. For the cost of a GTX 970 (Around $300), it isnt worth it for a 20-30% increase.