High core speed or high amount of memory for GPU

hanjet70

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Jan 21, 2016
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Gigabyte GTX 750 ti
Core speed: 1059
Ram 4gb

Asus Strix GTX 750 ti
Core speed:1124
Ram: 2gb

Which one will give more impact on gaming performance??
 

hanjet70

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Jan 21, 2016
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4,510
well, Im thinking to get the gtx 960 and will it bottleneck by the A10 5800k?