Hello
I think that this information can be found in the memory module itself. Seek and ye shall find... (;-)
If this is about calculating the total load in relation to the power supply, it definitely doesn't matter. It is almost certainly only single-digit wattage that a memory bar consumes. For the very large consumers, the GPU and the CPU are the most important. Even hard disks (HDDs) only need single-digit wattages.
Many greetings
Tom