Can i add a single 8GB or ram with my already installed 2x2 GB of RAM?

I need to upgrade my RAM. I have the original 2x2GB of RAM installed but want to know if i can add a single 8GB of RAM with the 2x2GB already installed? Please help?

Here is some info; and below that is an excerpt which appears to apply to your model:
http://support.apple.com/kb/HT1423?viewlocale=en_US
Additional notes  i5 and i7 Quad Core iMac computers come with both top memory slots populated. These computers will not start up if only a single DIMM is installed in any bottom slot; these computers should operate normally with a single DIMM installed in any top slot. Core Duo iMac computers should operate normally with a single DIMM installed in any slot, top or bottom. ("Top" and "bottom" slots refer to the orientation of the slots in the pictures below. "Top" refers to the slots closest to the display; "bottom" refers to the slots closest to the stand).
Now I always get confused which slots Apple deems to be the top or the bottom on the newer Macs - they seem to be looking at it from a different angle than I am. Yours is a 2011 - do you still have two rows with 2 slots each? Yours is working and recognizing it; if I remember correctly Apple calls the top what I'd call the bottom when the iMac is laying screen down. In any case, you should be fine as long as it's working.

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