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Measurements of an off-the-shelf DRAM chip confirm that different cells retain information for different amounts of time. This result extends to DRAM rows, or pages (retention time of a page is defined as the shortest retention time among its constituent cells). Currently, a single worst-case refresh period is selected based on the page with the shortest retention time. Even with refresh optimized for room temperature, the worst page limits the safe refresh period to no longer than 500 ms. Yet,doi:10.1109/hpca.2006.1598122 dblp:conf/hpca/VenkatesanHR06 fatcat:aexds5bvkvcxlk6h3jctodjufa