I came across this issue on Stack Exchange http://stackoverflow.com/q/35115865/479426, where a user is running out of memory in following our instructions for verifying a downloaded image in Windows (following the steps at https://docs.fedoraproject.org/en-US/Fedora/23/html/Installation_Guide/sect-verifying-images.html) The answers include a more efficient solution. (Note that Stack Exchange answers are CC-BY-SA 3.0, just like our installation guide.)
There's been a variety of reports against this PowerShell checksum verification sequence that I consolidated just this morning. It was an interesting proof of concept, but has proven arduous to maintain and cumbersome to implement. I'm looking into a better utility for the job. *** This bug has been marked as a duplicate of bug 1175759 ***