While there is effectivly no limit to the memory you can allocate to the JVM on a 64bit machine (up to the actual amount of physical memory) you probably shouldn't go beyond 50% on a dedicated server, especially one that is running Windows. Remember that the OS and the rest of the system need memory as well. I run dedicated Windows CF9 servers with 8GB installed ram with4GB for the CF JVM and they run very well. BUT that is a dedicated CF server NOT running MySQL.
Depending on the load and the type of application, you could also hit a point of diminishing returns if too much memory is allocated. Sometimes, the overhead of recordkeeping on all the memory is wastful if it isn't actually getting used.
Check out this article on 64 CF. Its for CF8 but all the principles still apply:
http://www.adobe.com/devnet/coldfusion/articles/64_bit.html
Depending on your application, load, and size of the database, things will get complicated running MySQL on the same box. Of course if its a database
of a few thousand rows it shouldn't be a problem. If you have a database in the gigabytes and depending on your database engines (InnoDB vs MyISAM)
you can run into some serious performance bottlenecks as the database, cf, and the os all compete for resources.
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