XMP tRFC @ 3200 is 560/416/256 and what you said for 2400 MHz, but yeah DIMMs failed again

there's not a single 3000+ DIMM in the QVL
http://www.asrock.com/MB/AMD/Fatal1t...dex.asp#Memory

frankly, I haven't seen this board run high-speed DIMMs (3200+) of any brand without errors

makes my head spin cause AB350 K4 ($95) runs everything smoothly out of the box