The best programm to check the difference between different ram-timings, is Pifast, it gives u a way better steady results than SuperPI! And it reacts spontaneous for every little performance increase.
Just a few tests, and u can see, that all reserved values have no influence for the results. But, as an example, Idle Cicle Limit from 16 to 0 gives u a good improvment.
http://img442.imageshack.us/img442/8...timings6oi.jpg
http://img442.imageshack.us/img442/7...timings6pe.jpg
http://img442.imageshack.us/img442/2...timings6wt.jpg
http://img442.imageshack.us/img442/3783/cas159tv.jpg
As u can see, all the reserved values, not supported by IMC of A64, gives u no improvment, it's just an optical gimmick, nothing more and nothing less!
Edit: The fastest timings my DFI/IMC/BH5 can handle without an reboot, after Bios-screen.
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