As per this data sheet (http://omapworld.com/4430_8Gb__DDR_PoP_1...), each SDRAM chip has two 32-bit data channels, meaning that there is actually twice as much bandwidth as the iPad 2 / A5!
Two chips, each with two 32-bit interfaces means the A5X has a 128-bit wide interface (backed up by the UBM die floorplan analysis). At 800MT/s (on a 400MHz clock), that corresponds to 12.8GB/s!
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