How to Determine if iMac (previous gen.) can take 6 GB RAM

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jdc wrote:
if you check the OWC site, it will tell you what you can take or not... i think you are limited to 4 -- it was the previous models that do 6 -- but still $180 like pinkoos said (which is actually cheaper than i paid for my 4 gigs when i first bought my imac...)

http://eshop.macsales.com/shop/apple/memory/iMac

I'm confused on this too. Unless I'm missing something, the link above lists only the recent 2009 models as being able to support more than 4GB. Does anybody have a link to a vendor site listing a previous generation iMac as accepting, even unofficially, 6GB of RAM?

Thanks.