Yeah, I saw a decrease in benchmarks when set to 1867, generally. One run I'd get better, then the second Id get worse. 1800 was consistent, and only about 1% worse.@Sagath and @Skippman, are you guys actually setting FCLK/Infinity Fabric frequency under the AMD CBS and/or AMD Overclocking sections? I had to forcefully set it as 1867. For me, at least, 1900 needs a lot of voltage to even boot successfully, so I gave up even attempting to get it stable.
Based on other people, I believe 1.4-1.45V is generally okay for the RAM these days, assuming you have some airflow over them.