Problème pour installer OS X Mountain Lion

Bonjour,
Je voudrais installer en ligne OS X Mountain Lion, mais un message d'erreur apparait indiquant :
"Impossible de finaliser votre achat
OS X 10.8 requiert au moins 2 Go de mémoire."
Mon imac a pourtant une capacité de 250 Go et 100Go de libre...
Apparement ça serait 2Go de RAM qu'il faudrait ??
Mais comment savoir combien de RAM il reste sur mon mac ???
Merci d'avance

And how could i know the memory of my computer ?
Mac OS X 10.6: Le menu Pomme
Can i add more ?
If your model is one of those listed on the page linked above, yes.

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