Just be aware that for a period of time the MX 500 had many reports of high failure rate. Not sure if it was due to a change of components or firmware.
Example post about it: https://www.reddit.com/r/sysadmin/comments/whr5ek/crucial_mx500_historically_good_recent_batches/
An article (In Portuguese).
And another post about it.
Just want to add that at the moment AV1 is only beneficial for encoding to lower bitrate videos.
It’s still better to use x265 for high bitrate.