如果體積增大，記憶會變慢嗎？

有時，推測一下如果對硬體元件進行了更改，系統的執行方式會有多大的不同是很有趣的。今天的超級使用者問答帖子討論瞭如何增加記憶體以滿足讀者的好奇心。...

有時，推測一下如果對硬體元件進行了更改，系統的執行方式會有多大的不同是很有趣的。今天的超級使用者問答帖子討論瞭如何增加記憶體以滿足讀者的好奇心。

今天的問答環節是由SuperUser提供的，SuperUser是Stack Exchange的一個分支，是一個由社群驅動的問答網站分組。

圖片由WDA協會（Flickr）提供。

問題

超級使用者讀者spartacus想知道增加記憶體大小是否會導致它變慢：

If we increased the size of SDRAM using the same technology, would the resp***e time become slower? If it did become slower, would it be due to the complexity of digital logic?

大小的增加會導致記憶體變慢嗎？

答案

超級使用者貢獻者danielr Hicks和Shikhar Bhardwaj為我們提供了答案。首先，丹尼爾·希克斯：

Yes and no. As duDE states, memory will never run faster than the bus/clock speed driving it, but the maximum speed of memory is definitely dependent on size.

As a memory assembly gets larger, the number of levels of address decoder increase (with the log of size), and the load on the drivers increases linearly (producing roughly a logarithmic increase in delay).

So, while it is rarely worthwhile to limit the size of RAM in a off-the-shelf system in an attempt to increase speed (there are excepti*** where the box adjusts clock speed based on the size of RAM), if you are a system designer, the maximum RAM size is one of the performance trade-offs you must c***ider.

接著是希哈爾·巴爾德瓦吉的回答：

No, it does not. As SDRAM is synchronized with the system, memory speed depends on the speed of the system. What may affect the speed of memory access is the configuration it is used in.

If your build already has a dual-channel (or triple-channel) configuration, and the increased memory does not use identical modules, then you may slow down to single-channel operation. However, this decrease is hardly noticeable, as Wikipedia says:

Tom’s Hardware found little significant difference between single-channel and dual-channel configurati*** in synthetic and gaming benchmarks (using a “modern (2007)” system setup). In its tests, dual-channel gave at best a 5 percent speed increase in memory-intensive tasks.

In this case, the speed may decrease, but you will experience an overall boost in performance due to the greater amount of physical memory available to your operating system. This, of course, depends on the operating system you are using and how efficient it is at utilizing the available resources.

有什麼要補充的解釋嗎？在評論中發出聲音。想從其他精通技術的Stack Exchange使用者那裡瞭解更多答案嗎？在這裡檢視完整的討論主題。