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memory chips stacked on top of one another, with a wider data bus.
** PSRAM (Pseudostatic RAM) This is DRAM which has circuitry to perform memory refresh on the chip, so that it acts like SRAM, allowing the external memory controller to be shut down to save energy. It is used in a few game consoles such as the Wii.
* SRAM (Static random-access memory)

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