拥有一台拥有大量内存的电脑是一件美妙的事情，但是如果所有的内存都不经常被使用的话，它是否有可能更快呢？今天的超级用户问答帖子回答了一位好奇的读者的问题。

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

照片由丹尼尔·迪翁（Flickr）提供。

问题

超级用户读者Keavon想知道，如果所有内存都没有正常使用，RAM更多的计算机是否会更快：

Suppose I have a computer with 16 GB of memory. If my computer is usually using about 4 GB of memory and never reaches 8 GB, is it any faster than a computer with only 8 GB of (the same type of) memory? Would my computer run as equally fast by removing half of the 16 GB and working with only 8 GB or memory?

如果Keavon从他的电脑中取出一半的RAM，他会注意到性能上的差异吗？

答案

超级用户贡献者Wyzard和Jason为我们提供了答案。首先，Wyzard：

Yes, because the operating system can use the extra RAM as disk cache, which speeds up access to data on the disk. Extra RAM will not make CPU-bound computati*** (not involving much disk I/O) faster though.

接着是杰森的回答：

Since every operating system manages memory differently, and none was listed in the original question, I will answer in the context of Windows 7.

Below is an example from a computer with 24 GB of RAM. Even though only 7 GB is currently allocated as “In Use” memory, another 10 GB is allocated as “Standby” memory and contains data that may or may not be read again. If it is read, it will make your computer faster. The “Free” memory is not being utilized whatsoever at the moment.

• “Available” memory includes Standby and Free
• “Cached” memory also includes Standby and Modified
• “Total” memory is all memory except Hardware Reserved

If you would like to learn more about memory usage in Windows 7, TechRepublic has a great article.

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