First let me say im not very good pc hardware so plz bare with me i have a premade asus g10ac and i wanna upgrade it,i wanna buy asus gtx 780 but im not sure if my other parts are up to it.My current setup is I7-4770 8g ram and a gtx 650 my psu was at 390w so i bought a corsair rm 850w gold so do you think my processor and ram are enough?and if my motherboard can handle gtx 650 can it handle 780?any help will be really appreciated and sorry for my bad grammar im from Greece.