Hey, i currently have two options available. i Either get a zotac gtx 780 amp edition for 300$, or an XFX R9290AENFC Radeon R9 290 for 250$. I came across something interesting, and noticed that this R9 can be unlocked to a 290x. Is the 780 still worth the extra 50$? and will it perform the same as the R9 290?