Yes indeed, PAE is required to add/enable for 32-bit systems because 32-bit couldn’t handle above 4gb. This is consistent with what you’re saying.
I’ve misspoken, though: PAE is necessary for many more systems than just 32-bit systems with more than 4GB of RAM. Many Linux distros (including what I believe is the case for 32-bit MineOS Turnkey using Wheezy) require PAE just outright, even if you don’t pass the memory threshold.
That said, I don’t think PAE should matter much in terms of getting MineOS up and running. Unless I’ve glossed over some really pertinent posts here, PAE should matter in pretty much two instances only: 1) did the system boot up without giving a PAE error? 2) did the system recognize and make available all the RAM expected?
And with 64 bit systems, as is this case and your own, PAE is irrelevant. Sorry for confusing contributions!