Will a single 4gb work with the Mini?

or have have 2+2gb? planning cheapest mini , upgrade ram 4gb.

thinking of getting this

http://eshop.macsales.com/item/owc/1333sam3s4gb/

also, mini buy have 1gb x 2, , daughter has imac 4gb. possible put 1gb cards in imac? suppose imac has 2+2gb?

 

what exact mac mini talking about?

identify mac , mac os x version, visualised in more elaborate image
identify mac , mac os x version using 25 second video tutorial (3mb, .mp4, h.264)​

 

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