nvidia gtx 750 ti 2gb vs nvidia gtx 960 2gb

[funboy1 the cake is a lie]

Hello , im looking to buy a new card i have a nvidia geforce 750 ti 2gb. And i wanna buy a gtx 960 2gb. But people say thats its not worth it is that true ? Do i not gonne see any difference at all ? For now i dont need the 4g because my screen ress is 1080p i cant play 4k so i dont need to 4gb yet . This are my specs. Amd a8 3.9 ghz quad core tubo boost 4.2 ghz. 16 gb ram nvidia gtx 750 ti 2gb

all info is welcome !