为什么RAM以2的幂数表示? [英] Why is RAM in powers of 2?

问题描述

为什么RAM的数量总是2的幂?

Why is the amount of RAM always a power of 2?

512、1024等

具体来说，Android模拟器使用512、768和1024 RAM有什么区别?

Specifically, what is the difference between using 512, 768, and 1024 RAM for an Android emulator?

推荐答案

内存与CPU紧密相关，因此使其大小为2的幂 意味着可以打包多个模块，而所需的逻辑最少 为了在它们之间切换；最后只需要一点点 被检查(因为大小的二进制表示是1000 ... 0000 不管它的大小如何)而不是更多的位数，这不是一种力量 的两个.

Memory is closely tied to the CPU, so making their size a power of two means that multiple modules can be packed requiring a minimum of logic in order to switch between them; only a few bits from the end need to be checked (since the binary representation of the size is 1000...0000 regardless of its size) instead of many more bits were it not a power of two.

硬盘驱动器未绑定到CPU，并且没有以相同的方式打包， 因此不需要其大小的准确性.

Hard drives are not tied to the CPU and not packed in the same manner, so exactness of their size is not required.

来自.谢谢布拉吉！

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