Chosen Solution

Upgraded my completely new MBA 2017 to ADATA SX8200 480GB, using the (short black) Sintech adapter. Upgrade went smooth, installed Mojave including ™ backup, with reported PCIe 2.0 4x speed, 5 GT from system report. No kernel paniks, no problem with stand by, and actully a very nice system stand by time.. Coconut Batt reports more than 11 hours battery time on a full charge. I did not use Kapton tape, as the adapter seemed factory shielded on that particular side. But alas.. even though everything seems good, and I’ve got terrific sequential speeds, something seems pretty wrong with (in particular) 4K WRITE speeds. Dont this seem way too low..??! o_O Thanks

Trying to contribute to shed some light, here’s the data squeezed from an i7 Air from 2014 with an original Apple SSD with 70% free space..hope it helps.

Yep! Way to low but thats to be expected as you used the wrong SSD! Review this great guide: The Ultimate Guide to Apple’s Proprietary SSDs. Return your stuff and get either a real Apple SSD or either an OWC or Transcend SSD designed for your system.

Well, my ADATA SX8200 is behaving just fine in write and speed as you can see its performance compared to original apple disk… Only battery life is getting pretty worse now. I guess I lose around one third of juice. and it is pretty disappointing. Is it the same for you, guys?