I alredey have 2 gigs of no name ram and i want to upgrade to 4 gigs (ddr 2) so can i just buy 2 sticks of ram from another brand like kingston or something and will it work as long as the clock speeds and all the specs are the same?
I'm not 100% sure, I wouldn't take any chances, ram is the stuff that usually goes wrong.
it should work, but you really need to ensure that ALL specs are the same, including speed, voltage, and timings.