Most listings show support for up to 192 GB using four 48 GB DIMMs; at least one listing shows support for up to 128 GB using four 32 GB DIMMs.
X870 and X870E models are engineered for AMD Ryzen 9000 Series processors. The B550 listing is described as compatible with Ryzen 5000, 4000 G‑Series, and 3000 Series processors.
X870/X870E and B840 listings explicitly reference DDR5 support or enhanced DDR5 performance. The B550 listing does not clearly specify which DDR generation it supports in the provided details.
