help identify numbers on this chip?
its a DDR ram chip, made by samsung, part "K4D551638F-TC40". the number that changes on two of the four chips is on the first line, with the word "Samsung". one two of the chips its a "510", while on the other two its a "540". if i google the chip and go to images, most of the results show one with a 510 on it.
i know it isnt the clock speed, because according to the datasheet that is shown by the "TC40", so does anyone have a clue what those 3 digits on that first line mean? if anything?