Read the following post which nicely describes the solution and how to.

https://www.dell.com/community/Alienware-Desktops/Aurora-R7-replacing-PSU-with-EVGA/td-p/6190096

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@AuTomnZ wrote:

 

1. For the EVGA PSU, with a 4+4 pin connector, should I only use 4 pins and leave out the +4?

2. Additionally, on the PSU's end, the 8 pin should go into CPU or VGA for the GPU_PWR cable?

 

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1. No. Just treat it as another CPU power connection.

2. I suggest you consult manual for after-market PS. However, my guess would be PS-socket marked CPU. 

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@AuTomnZ wrote:

 

1), since my current stock PSU only has 4 pins going into GPU_PWR if it will cause problems that I plug in 8 pins

2) too much power potentially? -

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1. No

2. Not an issue since it only draws the power it needs.

Thanks for the response!

Just wanted to clarify for 1), since my current stock PSU only has 4 pins going into GPU_PWR if it will cause problems that I plug in 8 pins (too much power potentially? -- sorry, not very sure on this)