Your 17 R1 was the last Alienware laptop (along with the 18) with an MXM GPU and mobile Intel CPU that was replaceable. The Area-51M R1/R2 has a replaceable desktop socket CPU but it has the proprietary Dell format GPU so it really isn't upgradeable. All other models since 2014 have a soldered CPU and GPU, some also have soldered RAM It is a shame but that's the world of thin and light laptops.  17 R2 - R5 - Soldered CPU and GPU m17 R1 - R5 - Soldered CPU and GPU x17 R1 and R2 - Soldered CPU and GPU Area-51M R1 and R2 - Socketed CPU and Dell format GPU  
I'm buying a new 17" laptop I am interested in a 2020 - 2022 Alienware I love the design and specs on these I can't find out which years or models are soldered to the motherboard. I hate this because if a cpu or GPU dies you are in a world of hurt $$$$ wise.
Which Alienware can you remove CPU and GPU ?