Philip Billena writes <<<< just like to ask if i can use two 512 ram with different manufacturer in my pc >>>> WELL......one of those questions which can only be answered " may or may not work". only sort of trial and error method will give a definitive picture. generally and to be on the safe side RAM is used in matching pairs so...I would'nt advise sticks from different vendors. have a nice day-----Venkat PCBUILD's List Owners: Bob Wright<[log in to unmask]> Drew Dunn<[log in to unmask]>