How do I find the number 1 slot for an additional RAM module in a mid 2010 21.5' iMac.

The basic machine has two 2GB modules installed in the upper slots. I would like to take advantage of the slight increase in performance one gets when a single 4GB card is correctly installed in the number 1 slot however I am unable to determine which is the number 1 slot.

Currently the memory slots shown in 'About this Mac' are, top to bottom: empty, 2 GB, 2GB, 4 GB. I believe they should be 4 GB, 2GB, 2GB, empty?

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