We have a Macbook with only 1.667GB RAM, can we upgrade to Lion, as I see it says we need 2GB?

We have several Apple products iPad2 and iPhone 4S.  We currently use Mobileme and would like to use iCloud.  To run iCloud on our Macbook, it says we need Lion, which requires 2GB of RAM. 
Can we add more memory or will we have to buy a new Mac or Macbook.
It would be such a shame as Macbook still performs really well!

You can put two 2gb RAM sticks in your model 2,1 but it can only use 3,3gb. This is a hardware limitation and cannot be changed. http://en.wikipedia.org/wiki/3_GB_barrier
http://www.everymac.com/systems/apple/macbook_pro/faq/macbook-pro-core-2-duo-3-g b-memory-limitation-details.html
OWC tests have found that there is a slight speed increase with having two 2gb sticks in rather than one 1gb and one 2gb. Your model is in the gray lines at the bottom of the graph. http://eshop.macsales.com/shop/Memory_Benchmark/Apple_MacBook/
In England the best place for memory is Crucial UK http://www.crucial.com/uk/
Here are instructions on replacing RAM in a MacBook with a removable battery.  http://homeoffice.consumerelectronicsnet.com/articles/viewarticle.jsp?id=44404

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