Let me make this as plain as can be, when you buy an Alienware you are not getting a "real PC"
Now what do I mean by this? I don't mean this in a snobby "the only real PC is a self built one" but the fact that Alienware and Dell tend to put there own special cards in them that you cant get anywhere else.
So that 3080 won't really be a 3080, what will happen is it will sound like a jet engine after 5 minutes of play and then thermal throttle down to much lower preformance just to keep operational. Every other component will be the cheapest it possible can be, the motherboard will most likely be some unknown cheap board, the PSU most likely won't even be rated and the ram will be a single stick and look 20 years old.
I won't tell you to build your own, but have a look at a local system builder as they will always use consumer parts, which at there absolute worst will be superior to whatever is in an alienware.
Does that look like the inside of a machine that costs 2000+ bucks? No, that's the reason Alienware don't have glass panels because they literally arnt, the plastic shell will look nice, but I can guarantee what ever performance you should be getting on paper, slap 10-25% off it and that will be what your really getting. You will struggle to upgrade this in future because you will require special shortend versions of GPU's just to fit in the case. etc etc.
2080 Ti but this is the quality you are getting here, from review of the current R11 I would advise you look for a version with either the 5600x or the 5900x, the reason? The 5800x runs exceptionally hot for an AMD product and the Alienware liquid cooling cant keep up because it sucks, it sucks so much that the latest firmware update to the MB disables the boosting feature of the chips to try and stop the machines shutting off. Which dell states as "Enhanced the thermal stability of the system" yeah at the cost of no more boost to 4.7Ghz your stuck at the 3.8Ghz base clock.
make sure to watch this official video advising you to download said firmware which TOTTALY is a good thing that is not slashing your brand new chips gaming performance to below 3800x performance, oh and also make sure to then "stress test" the system using the official Alienware tool.... you know rather than something third party like OCCT which would actually stress the system guaranteeing a thermal throttle. Wait why would a company put a video out about how to avoid thermal throttling on there new PC's and never advise to open the case up but instead download new firmware? Remember when Apple where patching in lower performance to make sure the "battery's lasted longer" on older devices, yeah kinda like that.