This version is very unstable.

A friend of mine has all the supposed requirements and oodles more and he can't keep 6.5 running on his system more than about 3 or 4 minutes before it takes a dive of one sort or another, and support has not been able to help him much so far. Previous recent releases haven't fared a whole lot better, not on his system anyway.

And judging by the state of their user forums, he's got plenty of company.

Fortunately, I never upgraded.

Good luck to you. Seems with 6.5 you are likely to need it.