[SOLVED] Intel "3D2" QLC NAND?

I have been looking at Intel SSD's. I see 2 different 512GB 660p series models, SSDPEKNW512G8XT and SSDPEKNW512G8X1. The only difference i see is one uses "3D2" QLC NAND and the other uses "3D" QLC NAND . Can anyone explain the difference?
 
According to NewMaxx on Reddit there is a difference between Intel 3D and 3D2 NAND.

..."3D2" means 2nd generation 3D NAND, or 64L, and it's TLC. It's a Youngsville refresh meaning it uses the new NAND (vs. "3D1" or 32L)...

Intel Codename_______Memory type_________Seq. read/write MB/s____Introduced
Youngsville___________32-Layer 3D1 TLC_____500/470-190____________Q3 2017
Youngsville Refresh___64-Layer 3D2 TLC_____560/510-280____________Q3 2018
 

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