To make sure you get the right one, look at the memory standard your motherboard supports: If it says something like DDR3 1333 or DDR3 1600, just buy memory with that same value and you should be fine.
How long after being exposed to the stomach flu until symptoms show? typically it is between 24-46 hours (most often starts after 36 hours) but can be aslong as 72 hours.
After a person is exposed to the parasite, it usually takes 7 to 10 days for the infection to develop, but it can take from 3 to 25 days or longer. You can pass the infection to others during the entire time you are infected. You may be infected for months, even if you don't have symptoms.