The Benefits of adjustable REFCLK motherboards Asus CH6, Asrock Taich and Gaming professional, Gigabyte K7.
The higher thye ram frequency, the better the bandwidth is in connections to the Memory controller, Clocking ram above 3200 while selecting a lower divider and higher refclk tightens the secondary timings and improves the Ryzen "poor gaming performance" up to levels similar to broadwell-e. Of course things are getting better all the time but getting there is still dependent on the type of ram (Samsung B-Die chips are the recommended type) and a bit of luck
DRAM frequencies achieved to date on ambient cooling, fully stable
1xSingle Rank Dimm per channel - Rated speed DDR4-3300 to 3466 - best case running at DDR4-3600
1xDual Rank per channel - Rated speed DDR4-3200 (120×2666) - best case running at DDR4-3300
2xSingle Rank per channel - Rated speed DDR4-3000 (112.5×2666) - best case running at DDR4-3200
2xDual Rank per channel - Rated speed DDR4-3000 (112.5×2666) - Best Case running at DDR4-3200