The motherboard decides half of this in advance: DDR4 and DDR5 modules are not interchangeable, a laptop takes SO-DIMM and a desktop DIMM. Two-module kits, 2 × 16 GB for example, are tested together at the factory and allow dual-channel mode, which a single large module cannot give. Kingston FURY Beast and Goodram IRDM cover both the 3200 MT/s DDR4 and the 6000–6400 MT/s DDR5 class.
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The motherboard decides half of this in advance: DDR4 and DDR5 modules are not interchangeable, a laptop takes SO-DIMM and a desktop DIMM. Two-module kits, 2 × 16 GB for example, are tested together at the factory and allow dual-channel mode, which a single large module cannot give. Kingston FURY Beast and Goodram IRDM cover both the 3200 MT/s DDR4 and the 6000–6400 MT/s DDR5 class.