Both pc's will run with 4gb of ram but my 64bit pc will not run 5gb eventhough my 32 bit pc runs perfectly fine with 5gb of ram. Help please?

if recalbox still runs slower on the n64 games you could try installing it on a pc 32 bit or 64 bit.
32 bit pc's are built before 2010 and64 bit pc's are built after 2010. you can go to the download link here for dragoblaze 32 bit/64 bit. https://archive.recalbox.com/ i have installed it on my pc using the 64 bit version and runs n64 games alot nicer but still lags at times using a clean 4gb of ram. if this doesn't solve your problen you can go to my page about running n64 games on recalbox.