Hi Guys Recently I bought a laptop of Dell and thought of upgrading the ram from 4gb to 8gb from there itself, so bought another 4gb ram with the already fitted one in the Laptop. I was aware of the frequency table and to use the same frequency Rams but could not find the details of the Ram in the already fitted one and as advised by the shop retailer that it will work fine, bought the other ram with less frequency which was 1333mhz. Now one of it runs in 1600mhz and the other in 1333mhz. Will it create any problem for the laptop or the speed? The laptop has been doing fine but is it allowed to keep it running with two different ram frequency. I am not interested to spend anymore on the Ram and would like to know your suggestions.