I would not think so. Read the following forum post.

https://www.dell.com/community/Alienware-Desktops/Aurora-R6-compatible-with-8700k-RTX-2080/td-p/6224703

https://ark.intel.com/content/www/us/en/ark/products/97147/intel-core-i5-7400-processor-6m-cache-up-to-3-50-ghz.html

https://ark.intel.com/content/www/us/en/ark/products/126684/intel-core-i7-8700k-processor-12m-cache-up-to-4-70-ghz.html

They both are LGA1151 but one is 65W and one is 95W.

The other issue is Ram Speed and Bios Microcode.

@DELL-Chris M might have the answer.

The following CPU's would work fine.

5K57J i3-7100,3.90GHz,51w,3MB,Kaby Lake-S
676P1 i3-7320,4.10GHz,51w,4MB,Kaby Lake-S
C2F6M i5-7400,3.00-3.50GHz,65w,6MB,Kaby Lake-S
RD7W7 i5-7600K,3.80-4.00GHz,91w,6MB,Kaby Lake-S
JF87D i7-7700,3.60-4.20GHz,65w,8MB,Kaby Lake-S
GY6VY i7-7700K,4.20-4.40GHz,91w,8MB,Kaby Lake-S

Also, you'll need to get a liquid cooling system.

https://www.dell.com/community/Alienware-Desktops/Aurora-R6-installing-a-Corsair-H60/td-p/6108251/page/2

Hi @Plasma_Heart,

Alienware Aurora R6 shipped with the following processor options:

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@Plasma_Heart wrote:

I was wondering if I can take my Intel Core i5-7400 CPU out and replace it with the Intel Core i7-8700K CPU?

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Probably not.

I would try a Intel i7-7700 . Yes, the non-K-class model because you have no VRM-Heatsink on MB.

Drop-in a Liquid-Cooler while you are in there. :Yes:

Would it be worthwhile to replace my i5-7400 with an i7-7700?

I had heard some mention a bottlenecking with the i5-7400. The i7-7700 is $300 without the cooler, 

I’m not looking to overclock or liquid cool anything. I would plan to upgrade my RAM to dual-band (16x2) @ 2666Mhz and add an M.2 SSD while I’m at it, but I’m curious if it would be worth it to replace the CPU. Otherwise I’ll just save up for a new rig.

I game in 1080p@60Hz

Aurora R6 [i5-7400, 16GB RAM (I’m assuming it’s just one stick lol), GTX 1060 6GB, 2T mechanical HDD]