I have been astounded by how cheap computer memory has gotten.
A stick of 2GB DDR3 memory is only $45. That is amazing. A few years ago that much memory would have cost hundreds of bucks.
If you want to put 4 GB in your iMac, you can get 2 sticks for $90.
But the iMac only has 2 memory slots. If you want more than 4GB, then you need to get a larger stick. The next size up from 2GB is 4GB.
And it costs?
A minimum of $240. Ouch! That is a price I am more used to. Looks like it will be a while before we upgrade our Macs with more than 4 GB...
