DRAM pages are indeed larger; but a single bus transaction does not have to read the whole DRAM page. Tons more info here: <a href="https:&#x2F;&#x2F;www.akkadia.org&#x2F;drepper&#x2F;cpumemory.pdf" rel="nofollow">https:&#x2F;&#x2F;www.akkadia.org&#x2F;drepper&#x2F;cpumemory.pdf</a>