64bit MySQL?
 

I was going through some of the guides and while doing so, I saw a couple things mentioned here and there about some issues pertaining to not having the compatability for 64bit processors, mainly issues with MySQL. Does anyone know if there is a 64bit edition of MySQL? I honestly haven't started anything yet due to this possible complication. Is it something such as simply replacing MySQL with a 64bit edition, and then continuing with whatever guide I was following?

Any help would be appreciated, thanks