I would like to upgrade my Imac 8,1 from 1 Gb to 4Gb RAM. Apple does not have memory for this Imac but recommended Crucial, Kingston or Ramjet. I have noticed a difference in pricing and would like to know if there are differences in their chips?

I would like to upgrade my Imac 8,1 (20 inch early 2008) from 1Gb RAM to 4 Gb. Apple no longer provides 800Mhz2DDR2 SDRAM but recommended Crucial, Kingston or RAMjet.
Are there any difference in these vendors chips as the price range is from $51-$99?
Thanks, Johng

I'm coming late to this string because I now have the same issue as gillnfly and you have all solved virtually all of my questions - thanks!  My only other question to add to what you've already said is - I currently have 1 G of memory installed.  Can I ADD a 2G card to get to 3G (probably more than I need), or should cards match if you have more than 1 - i.e., 2 1G cards or replace existing 1G with a 2G, or even 2 2G cards (way more than I need).
Thanks for your spot-on comments!  I already found the OWC website and you've confirmed that's the best place to go.

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