hello , i want to upgrade my card currently i have a gtx 660
specs are
i5 3470
sirtec 550w
8 gb ram
1920x1080 120hz
which its better ? gtx 680 bbn , or r9 280x msi/hd 7970ge
Well The 280x and the 7970GE are the same card and the 680 - 770 are the same card and they are all within a few fps of each other depending on the clock. They are all basically exactly the same so get the cheapest one. Or give us you budget and maybe we can help you get a little more for your buck.
From the looks of it his budget is around $200, in which case a GTX 960 or a R9 285 would be your best bet. Pretty much the same performance wise from the above cards, but have newer tech and better driver support.