I need to replace some Samsung 512MB DDR2 PC2-4200U 533MHz 1Rx8 M378T6553CZ3-CD5 sticks for 1GB sticks, but I am only finding a bunch of "PC2-4200" 1GB sticks. I am hesitate to buy because I can't seem to figure out what the difference is or if they are both the same thing.
Are they both the same or different technologies?
Best Answer
I believe the "U" suffix is referring to "Unbuffered" as opposed to "Registered" memory.
From Wikipedia:
It is typical to leave the unbuffered (standard - non-error-correction) status off of the part number (i.e PC2-4200 is equivalent to PC2-4200U) but it could be that some manufacturers have chosen to explicitly state whether their memory is Unbuffered, Registered or so on.
If you have a standard home computer you will almost certainly want unbuffered memory.