So, 16GB - 1Rx8 DDR4 the "16GB" is what I'm looking for when you say 8GB X 2 = 16GB or is it "1Rx8"? Sorry, I'm new to this and trying to wrap my head around it, lol.   Edit: I'm not ordering a PC, I already have it.    You would need Quality: 2 of this   [URL] for 16gb total system memory. If you have 2 exactly-matched uDIMMs, (in a Memory-Bank) they should run in the faster "Dual Channel" mode. Dell Memory Upgrade - 8GB - 1Rx8 DDR4 UDIMM 3200MHz XMP "8GB" is the size per uDIMM module. "1Rx8" must be the "Ranking" or how the chips are laid-out (and addressed) on the uDIMM. "DDR4 UDIMM 3200MHz XMP" is the specification.
Not sure which is best for my specs. I'm very hesitant since I didn't make the wisest decision when building my PC via Dell. My previous issue was in regard to the PC bottle necking during and shortly after gameplay and found it to most likely be my RAM and Storage device. Specs: NVIDIA GeForce GTX 1660 SUPER 6GB GDDR6 1TB 7200RPM SATA 6Gb/s 8GB, 1x8GB, DDR4, 3200MHz, XMP 11th Gen Intel Core i7 11700F (8-Core, 16MB Cache, 2.5GHz to 4.9GHz w/Intel Turbo Boost Max) The issue is both with the RAM and Storage. I'm currently looking under the Aurora R12 Parts section on Dell and don't see many choices, not that I really would need any. I would like to try to get the parts from Dell because I have excellent credit with them and pay monthly on their products, never having to pay in full up front. So, which under the parts and upgrades section should I get for RAM and Storage?  Alienware Aurora R12 Parts & Upgrades Here are the compatible parts for the R12. 
Aurora R12, which RAM and Storage should I get?