Here is what the processor can support:
What the laptop motherboard/bios supports is a different story.
Doc (not an Intel employee or contractor)
[Maybe Windows 12 will be better]
The processors can support motherboard designs that work with DDR4 or DDR5 (but not both). From a bus frequency standpoint, this is dependent upon the quality of the motherboard, the noise being produced by other components in the laptop (which could further limit it) and the BIOS Memory Initialization code that is provided. Bottom line, only the manufacturer of the laptop can tell you exactly what they support. Go back to your laptop manufacturer's support people and tell them to do their jobs and get you the information.