Which CPU Cooler? Can a heatsink too close to GPU increase temps?

I am relatively new to PC's and need to change my CPU fan. I am choosing between a Noctua NH-U14S and a Noctua NH-U12S. The 14 will keep my Haswell cooler. but it is bigger and the heatsink would be very close to my GPU and I do not want to increase the GPU temperature as a side effect. Here are two images of the fans from a comparison video (my case is somewhat similar, a HAF X):

The one closer to the GPU is the U14S. Could that cause a higher temp on my GPU, and which fan would you choose?

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More about cpu cooler heatsink close gpu increase temps
  1. Best answer
    Cooler master 212 will do it

    No because the heat will be immediately blown off by the fan
  2. So go for the larger?
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