All goodHope that went ok, you haven't posted since!
Spent a few hours after seeing what my 64G trident Z kit was capable of so lots of reboots and no time to post on the boards.
So far 6600 is no go, errors quickly in a 10 min stress test. 6400 looks like it may be OK but the temps creep up higher than I'd like at the moment. 6200 is totally fine, so I'll likely not spend too much more time on ram tuning at the moment.
I don't fully have cooling airflow in the build yet, just an open case with AIO attached and no case fans installed yet, and I had to bump the DDR voltage 1.5v so that 6600 would boot, 10 min memory stress at 6400 with 1.45v makes the sticks creep up towards 60c. I guess I'll maybe wait until the build is finished and the fans are installed to do any more ram tuning. I said to myself I wasn't going to, but I can't help myself when it comes to overclocking!