no one knows?

You should be able to, but you cannot use the eighth generation on your motherboard.  The cooler is available for $100, but the larger power supply is recommended also.  Consult tech support.

The Dell 850w will run a GTX-1070 or a GTX-1080, no problem.

The Aurora-R5 with Intel i7-6700 is fine the way it is. It's not like you have an i5. The i7-6700K is basically the same chip. Real-world benefits of Over-Clocking are minimal. 

The motherboard that shipped with the i7-6700K is slightly different. It has the VRM-heat-sink installed, and might even have a different BIOS micro-code to allow that chip to work. See old forum posts about all the users trying processor swaps (with mixed results). 

I do suggest you install the Alienware (Asetek-made) Liquid-Cooler. Not sure why they allow you to buy an Intel-i7 config without it.

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@molismenos wrote:
1. I was thinking to update to i7 7700k so
2. I would have a difference...
3. Can I upgrade to that? Or just 6700k?

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1. Pretty sure Alienware formally announced they were NOT supporting that. Search forum.

2. Even then, real-world difference it very small

3. I guess I didn't make myself clear. I think the real answer is NEITHER.

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@molismenos wrote:
Ooo good...So I payed so much dollars and I can’t even swap to 6700k and have a stable system with over clock at about 4.7ghz...thank you very much so I stay like that and not even change to 6700k right?

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I already answered that (the best I can).

Maybe you should search old "Alienware General" forum and come to your own conclusions?

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@molismenos wrote:
Thank you for your help and your time, I will just take a GTX 1080 Ti and a cpu cooler and I think I will be ok, maybe put a 16gb ram+ to mine.

Thanks for your time.

P.s tell me your opinion about that
https://www.amazon.com/gp/aw/d/B079T6BC3M/ref=mp_s_a_1_3?ie=UTF8&qid=1520308147&sr=8-3&pi=AC_SX236_SY340_QL65&keywords=alienware+liquid+cooling&dpPl=1&dpID=4117m4b84UL&ref=plSrch

Take that or the order you told me before Asetek version?

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AFAIK, all Alienware Intel-processor Liquid-Coolers are made by Asetek. Always have been all these years.

That looks about right, but you should probably come-up with the Dell Part Number (DPN) for the one you really need. Dell Parts should have them (you would think).

If you look closely, that one is USED. A new one would be better.