Well i went on ahead and installed the memory. At least followed the advice corsair rep gave me. Don't mix different types of memory. I think he meant about latency issues. So, I guess it's safe to say that as long as all the memory one uses on the G5 they should try to match up latency and speed. That way less conflicts. At least I hope that is the case. And also hope that I don't run into any type of conflicts with my new RAM. Did pay a lot for them, a while back 😀