It's time for a RAM upgrade. Only problem is, when I look at all the options, I'm not sure which type I need. I think it should be 184 pin, DDR SDRAM. But, there are so many other options, I get confused. The comp is a few years old and the mother board can take two 1 gig cards. I have a single 512 in there now. That card doesn't give me any clue as to what type it is. Is there an easy way to check what type I have? Thanks for any help.