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    You cannot put DDR4 in a PCthat uses DDR3 and vice versa. ECC is for servers. Make sure you have enough slots and get regular ram of the same sort you have now (ddr3/4)
    – Journeyman Geek
    Commented Aug 16, 2017 at 3:52
  • Thank you for the suggestion. I looked up xps spec and it appears to support ddr4
    – J.E.Y
    Commented Aug 16, 2017 at 4:09
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    The one from Newegg is more expensive and slower. The PC4-xxxxx numbers are the theoretical maximum bandwidth figures for the sticks so you would be paying $200+ more for memory that is (in theory) 4000MB/s slower. Check your computer manual for the maximum speed memory your system supports and buy the fastest and cheapest you can.
    – Mokubai
    Commented Aug 16, 2017 at 6:52