A single in-line memory module comprising: a printed circuit card having a first and a second face and including connector means for coupling said printed circuit card to a circuit element; a plurality of memory devices disposed on said first and second faces, said memory devices arranged in first, second and third configurations; said first configuration comprising at least two memory elements disposed in a back to back position on said first and second faces and electrically coupled to one another; said second configuration comprising at least two of said first configurations coupled to one another in a side by side arrangement; said third configuration comprising at least two of said second configurations coupled together.