Hi [NAME] thank you for sharing your proposed SSD purchase.  Sorry that my multi-choice option messages are not clear. The Crucial System Advisor database has the most recent tested SSD options (up to 4TB) whereas it is rare for the Dell Documentation SSD Storage options to be updated (stuck at up to 2TB).   If affordable, both SSD slot one and two replacement drives should be a minimum of: -   The SSD slot one replacement (C:) boot drive should be 2TB or more. Example: ultrafast SSD 970 EVO Plus NVMe M.2 2280 2TB Memory & Storage - MZ-V7S2T0B/AM | Samsung US with 3,500MB/s Seq. Read or similar within your price range.   The SSD slot two new (D:) data drive can be 1TB, 2TB or more. Example: ultrafast SSD 970 EVO Plus NVMe M.2 2280 2TB Memory & Storage - MZ-V7S2T0B/AM | Samsung US with 3,500MB/s Seq. Read or similar within your price range.   If money no problem, both SSD slot one and two replacement drives, can be the same ultrafast 4TB capacity.  Please excuse me for trying to spend your money.  
l currently want to upgrade my Alienware m15 Ryzen Edition R5 storage. I am given a choice of either a Dell M.2 PCIe NVME Gen 3x4 Class 35 2230 SSD OR Dell M.2 PCIe NVMe Gen 3x4 Class 40 2280 SSD. I don't know if there's another difference other than the length? Both are compatible per the description. I also have seen that there was issues where these came without heart shields or installation screws. I have no clue which one to get and also does it replace my current drive? Or added to it?   Thanks for your help
m15 R5, which SSD?