I have an 21.5 Mid 2011 iMac and i want to upgrade my RAM.  Currently I have two 2GB and two free slots.  Do I have to put in two 2GB in the free slots or can I use two 4GB or 8GB?

I have an 21.5 Mid 2011 iMac and I want to upgrade my RAM.  Currently I have two 2GB and two free slots.  Do I have to put in two 2GB in the free slots or can I use two 4GB or 8GB?

You can leave the existing RAM in their current slots and add compatible modules in the empty slots. For best performance, add two of teh same size. Our 2010 iMac 21" shipped with 4GB RAM---two 2GB modules in two of the four slots. I added two 2GB modules to the empty slots and now have 8 GB RAM.
Be sure to order RAM from a trusted Mac-savvy RAM vendor. Some vendors thing a Mac is a hamburger. For over a decade I've bought all our Mac RAM (and we have 18 Macs in teh family!) from one vendor:
http://eshop.macsales.com/shop/memory/iMac/2011/DDR3_21.5_27
The link is to the proper RAM for your Mac.
Crucial.com is also a trusted vendor.

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