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lenovo y50 - i7 4710HQ - mPCI-e 2.0 x1

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Hi, I have some questions about egpu.
My laptop is lenovo y50-70 with i7-4710HQ and maxwell 860m. I made some cooling upgrade and can run on 3.5 ghz all the time at 100% (on stress test max temp. is 78 C). In past I could run about 3.0 and temp. was 90 C. And the gpu has poor preformance for this cpu. So I am thinking about egpu.

I have only one PCI-e 2.0 x1(wifi), so bandwidth is 5 GT/s. How will eGPU work on this port? Will it make big diffrence than 860m(maxwell)? Or it will bottleneck a lot, because of the slow x1 PCI-e 2.0 slot?

And if its worth, then what gpu is best? Amd or Nvidia?
I would not buy it right now, but maybe in Q2 or Q3 2018, but want to know.

PS: I will use external monitor for sure.

Edited by paklic9

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