Q: Will my iMac mid-2010 accept 2 8GB memory cards? Thanks!!

Hi,

I have a iMac mid-2010.

Currently, I have  4GB of RAM (2 slots of 2GB used) out of the 16GB maximum.

I know I have to buy the memory card that is specifically a 1333 MHZ DDR3 204-pin, but I am not sure whether to buy 4 packs of 4GB or 2 packs of  8GB memory cards.

When I looked up instructions on installing memory, it specifically said that for my  Mac Mid 2010 that I could use 2GB or 4GB of RAM of 1333 MHz DDR3 in each slot.

Here:

http://support.apple.com/kb/ht1423#4

However it never mentioned when iMac could accept 2 8GB memory cards in the slots.

Sorry the long explanation, but the question is --

1. Can I buy 2 packs of 8GB memory cards or will I have to buy 4 packs of 4 GB memory cards?

2.  Which brand should I buy?

Thank you so much!!