I have only participated on this forum recently. This is a good clue especially for newbie computer buyers, don't believe immediately what the sellers of branded PCs/parts are telling to you. More often the sellers don't have any idea what do the parts actually does (based on personal experience).
It would be better to do your own research in the internet, there are so many available resources online that can answer your questions. Be knowledgeable on what you will buy so you won't be duped in the end.