[M] Sabrent Rocket 64GB (4x16GB) 4800MHz DDR5 Memory Kit Review
 

While operating with two Rocket DDR5 modules of 16GB each, each running overclocked at 6000MHz it was quite an easy and straightforward task, we cannot say the same when all four slots are populated. In compatibility mode, as Intel recommends on the Z690 platform, 4000MHz is guaranteed and this is the speed the 64GB kit operates with in automatic mode. For running at 4800MHz, we needed a bit of extra voltage tweaking concerning VSA, VDDQ and VDD2 but in the end we could validate stability with TM5 and all benchmarks we ran afterwards have completed without any errors.

http://www.madshrimps.be/articles/article/1001378/