Hi [NAME]-game  the OP did not include link to the Alienware x17 R1 model being considered for purchase. The x17 R1 generalised Storage option provided might be for two 1TB WD SN730 PCIe Gen 3.0 x4 NVMe v1.3 SSDs in RAID 0 configuration for sequential read of up to 6700 MB/s and write of up to 4300 MB/s.  A single 2TB Samsung PM9A1 PCIe Gen 4.0 x4, NVMe v1.3 SSD with sequential read of up to 7000 MB/s and write of up to 5200 MB/s, will out perform the PCIe3 RAID 0 SSD setup.  Dell says the x17 R1 system can support up to one PCIe4 SSD, if users want to install one themselves.  A single OS(C:) boot drive is more reliable than two in RAID 0 configuration. Create PCIe Gen 4.0 SDD with the modern GPT partition table and use BIOS boot list option UEFI to get all the modern features and option to have more than 2TB. As part of disaster recovery plan, create (clone) a standby OS(C:) boot drive so that if recovery fails, the standby boot drive can be swapped in to get the system up and running within minutes. 
I am choosing the following configurations and am a little bit confused on which gen version will my SSD drives have.  Processor: 11th Gen Intel® Core™ i9 11980HK Video Card: NVIDIA® GeForce RTX™ 3080 Memory: 64GB DDR4 XMP 3466MHz Storage: Dual drives 2TB (2x 1TB) M.2 PCIe NVMe SSD RAID0 I understand that the laptop supports gen4, but for the actual SSD drives are they gen4 or gen3 in the configuration set up I have?  
x17 R1, SSD storage spec?