Surface 4 Micro Sd Slot

Micro

  1. Surface Pro 4 Microsd Slot
  2. Micro Sd Slot Surface Go

Surface Pro 4 Microsd Slot

May 30, 2017  island barbie, both the surface pro 4 and the 2017 surface pro have micro sd cards readers. Why they dont have full sized sd card readers, i dont know. Do you mind posting in the correct forum section? This is for the surface laptop.

Surface

Micro Sd Slot Surface Go

I purchased a 128GB Lexar 633x card recently
http://www.amazon.com/Lexar-High-Performance-MicroSDXC-Reader-LSDMI128BBNL633R/dp/B00O1M21H8/ref=cm_cr_pr_product_top?ie=UTF8
It is supposed to have write speeds on the order of 40MB/s, but under no circumstance am I getting much more than about 20MB/s - whether in transferring real files or in benchmarks, using the card reader or the usb3 port with the included adapter. Read speeds are good at 60-90MB/s and it's not counterfeit - I've nearly filled the thing and used it heavily for the last few weeks.
Some other reviewers are reporting the same write speeds, while others are showing speeds of 30-40MB/s.
Any thoughts? What write speeds are people getting from other cards?