resonator. n. 1. (Electronics) any body or system that displays resonance, esp a tuned electrical circuit or a conducting cavity in which microwaves are generated by a resonant current.. resonator-a hollow chamber whose dimensions allow the resonant oscillation of electromagnetic or acoustic waves. cavity resonator, resonating chamber. chamber-a natural or artificial enclosed space. soundbox, body-a resonating chamber in a musical instrument (as the body of a violin).
The other method of classifying the modules is by their bandwidth rating in megabytes per second. 1600MHz memory can run at a theoretically speed of 12.8 gigabytes per second or 12,800 megabytes per second.
DDR and DDR2 are not compatible. DDR memory of different speeds will usually work. If you put 512MB DDR 400ms CL3 and another with 256MB DDR 333ms CL2, all the memory will run at the 333 speed. (The bigger issue is the CL3 vs. CL2, these should be the same.) It is always best to match your memory for best performance.