Been playing around with my ram frequency and timings a bit since upgrading to Ryzen 2nd gen. Previously on a 2700x with 3600mhz c18 ram I couldn't get above 3333mhz without errors. Now on 2nd gen I'm at 3600mhz c16 with no errors and I think with a little bit more voltage I could be error free at c15. Not tried a higher frequency yet.
Should be a decent performance uplift.