如果您正在执行有史以来第一次RAM升级，那么看到一小块RAM模块突然“芯片脱落”可能是一个非常令人担忧的事件。但是，它是像它看起来那么糟糕还是RAM模块仍然可用？今天的超级用户问答帖子回答了一位忧心忡忡的读者的问题。

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。

问题

超级用户读者m-oliv想知道RAM模块上的灰色封顶是什么：

I was upgrading the RAM on my laptop and, after removing a RAM module, one of the little gray-capped things (circled in red in the image below) came off. Can someone please tell me what these things are and, if it is a potential danger to my laptop, should I replace the RAM module that had the piece knocked loose?

RAM模块上有什么灰色封顶的小东西？

答案

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

That is most likely a capacitor. While not dangerous in the traditional sense, it is necessary for the proper and c***istent functionality of the RAM module. So yes, you should c***ider this module busted and replace it. A decoupling capacitor acts as a noise filter that will help clean signals on the module, but without it, signal noise could cause bits to flip improperly/unexpectedly.

While that will not fry your computer, it could cause “strangeness” in your programs or operating system, such as hiccups in operation, bad data saves, or even full system crashes. If the computer is not in an electrically noisy environment, you may not even notice a difference. That said, I would still replace it as soon as I could.

As a general rule, when bits are removed from (or fall off of) an electrical circuit, it fundamentally changes the properties of the circuit. That makes it so it will not operate as intended (if at all), which is a polite way of saying “broken”.

接着是莫库拜的回答：

Those are almost definitely capacitors. I know because we use them extensively in electronics. The design of the board and position of the capacitors makes me strongly believe that they are simply decoupling capacitors. We put them across the power line and ground on a microchip like this as a filter to get rid of any noise on the chip power supply.

Its having been knocked off will not damage your computer unless it tore a bit of track so that the pads are now shorted together. Make sure that the pads are clear. Other than that, the worst that would happen is the RAM module might “mi**ehave” at times, though it would be difficult to say how problems might manifest.

The capacitor is essentially an open circuit to DC voltages, but effectively connects high frequency noise to a ground. There are generally a few placed close together near any lines that need protection, and losing one probably will not actually affect the RAM module much, if at all, but it might.

In case you care, the little black 8 pin packages at the bottom are 4-way resistor packs, almost certainly terminating the data lines going to the chips.

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图片来源：Jaroslaw W（Flickr）