Can I upgrade my GPU?

[mrsquiggy]

Can I upgrade my gpu?
Hello, I bought a Hp envy http://www.bestbuy.com/site/hp-envy-desktop-intel-core-i5-12gb-memory-2tb-hard-drive-gray/3199314.p?id=1219088673230&skuId=3199314.

I am currently running a gtx 660 (through legacy boot in BIOS) I have a 600W PSU
could I put in a gtx 780 ti?

 

[ThatGuyBrandon]

I'm gonna have to know the exact PSU model man. You can't just say 600w because some cheaper psu's are just not very good even though it says 600w