Reporting back:  Worked like a charm!  The new, upgraded WiFi module was literally plug and play.  I didn't even have to download a special driver for it.  The Inspiron 24-3475  is is now getting essentially the same internet speed over wifi that it would be getting over Cat 6A ethernet.  Download speeds are now more than 20x faster.  For the $20 part cost, it's well worth it.   So, anyone with this model computer who is reading this: you're in luck.  With the above changes and upgrades, you can have it performing much better than even factory fresh.   Good luck!
Unfortunately, my wife purchased the  Dell Inspiron 3475, and it runs ridiculously slow.  It came with 8GB 2133Mhz RAM and a 1TB hard drive.  No apparent hardware problems, but the task manager shows that it jumps to nearly continuous disk activity if asked to do nearly *anything*.  Strangely, the task manager shows that the amount of physical RAM being used never seems to rise above 3.6GB, so I'm not sure what the cause of the nearly constant disk activity would be.  Is it a BIOS problem, or some other problem?  It's running the latest 1.7 BIOS supplied by dell.  SMART reports no problems with the disk itself. This Dell Inspiron 3475 utilizes an AMD A9-9425 Radeon R5 CPU.  Even though AMD A9 CPU is prominently displayed on the monitor, I read on the AMD forum that AMD no longer supports this chip:  [URL]  What?  I don't see much support from Dell either with regards to this slowdown problem, despite many posts regarding the problem.  Why not? I'm going to do a "Fresh Start" windows install.  If that doesn't fix the problem, I'll try to further "decrapify" the apps and telemetry that Microsoft itself s now putting into Windows 10, though that may not be easy because some of the offenders, like Xbox bar and "Your Phone" have their uninstall  options removed.   If this doesn't succeed, then I may be forced to install Linux on it as a last resort.  I really expected better from a Dell than this.
Dell Inspiron 3475 AIO runs ridiculously slow