I recently obtained an older Dell Precision 420. The unusual occurance for me, is that instead of SDRAM it came with Rambus (got it for free from my job). Unfortunatly, I don't know anything really about Rambus.... It already has a pair of 256's in it and I was hoping to boost it up to 1GB by getting another pair. But I am unable to determine what speed it is. It has this labeled on it: Samsung Korea 0042 256MB/ 16 MR16R082GAN1-CG6DF 600-53 100 I was assuming that the 100 in the corner means its a PC100?? or is it a PC600?? I'm not sure. Then I was also wondering, can I make this machine into just SDRAM? Or does it always have to have Rambus now since it seems to have started off with it? And if I can change it, would it be cheaper to buy 2-512MB SDRAM vs. a set of 256MB Rambus? Any input would be helpful, Thanks.