In the title of the product it states "Non-ECC" but in the Specifications Tab it lists ECC "Yes" Which is it?

It's non-ECC. The specification sheet must have a typo. I ordered this for a Dell G5 15 5587, and it works fine. I recommended it to a friend who has the same model laptop, and it works fine in theirs as well.

Questions & Answers: SNPHYXPXC/8G - Dell Compatible 8GB PC4-21300 DDR4-2666MHz 1Rx8 1.2v Non-ECC SODIMM

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SNPHYXPXC/8G - Dell Compatible 8GB PC4-21300 DDR4-2666MHz 1Rx8 1.2v Non-ECC SODIMM

Equivalent to Dell Part Number: SNPHYXPXC/8G
8GB PC4-21300 DDR4-2666MHz 1Rx8 1.2v Non-ECC SODIMM
Third Party; 100% Dell Compatible
Meets or exceeds OEM specifications
Lifetime Warranty

$79^.45 –