24 minutes ago, sakamoto4 said:
I currently have a Corsair 16GB kit, 3000Mhz sku CMW16GX4M2C3000C15. Looking at some of the AsRock B550 motherboards, specifically the Steel Legend and Extreme 4, I see their Memory QVL list is incredibly small compared to other manufacturers, and my memory is not listed. Is there any way of knowing for sure that memory will be supported other than the QVL list? I would hate to buy a motherboard and be forced to get new memory since the motherboard cannot be returned once opened.
B550 boards are relatively new, so there simply hasn't been enough time passed to build up a remotely complete QVL. However, QVLs are never exhaustive anyways. Pretty much any 2133-3800Mhz RAM will just wrok. Things only get dicey at the high end with 4000+MHz RAM, though some older, and particularly lower quality boards might have issues with 3600 and 3800Mhz.
In short, if you've got a remotely decent board, and a Zen 2 chip, which you have out of the box with B550, then you're fine. Just don't get higher than 3800Mhz, which you shouldn't do anyways with Zen 2.