Hello everyone, i am new. If anyone could supply any info. i would be really grateful. I am sending HYNIX RAM pc2 5300(s) 555 latency to a friend in spain. SHe has pc2 5300. I do not know if the latency for her RAM is 444 or 555. However, am i correct in thinking, as many have said, the comp. simply works from the slowest RAm module. I have 2 identical modules of pc2 5300s, is it best just to put both in as they are identical. ANy info. warmly welcome.