For the large memory, run the program but how slow when going on? ?

My Toshiba laptop was originally a single original Samsung 512MB of memory, I think is not big enough to replace a 667 Kingston 2G of memory.Outcome of the run up large program but a little card, I would like to ask how this is the case? My CPU is the T5200

memory there has been a lot of great information! So slow that the situation may not be compatible, there is no recognition.
you that the 2G memory system has not been confirmed, it means less of 512M memory, so on the card.
just more than speculation there is only one explanation:the memory is not compatible Kingston memory or false buy .512M of the card you win you come, do not use, is not compatible