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Case for computer

Today we will talk about such an important thing as the computer case. This case is the foundation of our PC and it is necessary to approach its choice with all seriousness.

Often, the entire system unit is called the computer case, but this is not true! This case is a metal shell on which all the components of our computer are mounted. It is sometimes called the “case”. The functions of the case are also included;

protection of the “insides” of the system unit from external physical effects
maintaining optimal temperature conditions (with proper cooling organization)
shielding electromagnetic radiation generated by a working PC
If we immediately divide all cases for a computer into two large categories, then we will assign server solutions to the first, and all the rest (user computer cases) to the second.

Here, for example, looks like the case of one of our servers in the organization. This is the HP ProLiant ML150 from Hewlett-Packard:

To save space, I combined two photos into one. As you can see, this is a rather expensive “toy” (although outdated). This case has a lockable front panel under which three 5.25-inch drive bays (for optical drives or “pockets”) are conveniently located and six 3.5-inch drive bays (for installing hard drives). With this design, they are very easy to remove and install.

And here is the case of our server in comparison with a 15-inch CRT monitor:

Large enough and spacious inside. Is not it?

So what we see here:

two separate dual-core Intel Xeon processors (circled in red)
good 650 watt server power supply
three PCI-X slots on the motherboard
Pay attention to how the removal of warm air heated by processors is organized outside the case. The processor fans are mounted on one of the sides of the aluminum radiator and drive the heated air through a special plastic casing in the direction indicated by three arrows. There he is picked up by a large 14-centimeter fan mounted on the back wall of the system unit (blowing), which “ejects” heat from the computer case.

Note: PCI-X expansion slots (development of the PCI 64 standard) are used in high-performance systems, since having more contact pads (in fact, data lines) can provide a higher transfer rate (compared to a conventional PCI interface). Electrically and physically compatible with most old-style universal expansion cards.

Now we will organize the separation of the computer cases based on one more feature. I mean the case type “Desktop” (horizontal) and “Tower” (English “tower” – vertical).

Here, for example, such a desktop (desktop – a computer designed to be placed on a table) is in my home “museum of computer antiquities” and we affectionately call it “pony” 🙂

I think there’s no need to paint anything separately, you yourself see everything. This is a case horizontally located in space, the height of which “at the withers” is about 15 centimeters 🙂 Poking around inside such an exhibit (due to the design) is extremely uncomfortable, and the possibilities for upgrading and expanding the functionality are very limited here.

These are usually micro-ATX (ATX – Advanced Technology Extended) enclosures. Now this is the standard, and micro only means that the motherboard itself is smaller (especially for this setup). Micro-ATX cards can easily be installed in full-size ATX cases, but not vice versa! Similar solutions are also distinguished by the horizontal arrangement of the power supply and the built-in or low-profile external video card, not intended for “heavy” games.

Computer cases of the Tower type (vertically oriented in space), in turn, are also subdivided into various categories (depending on their dimensions: height, width and length). You can find a lot of names of sizes of cases, but I suggest you dwell on the most “popular” and popular in our market.

Again, there are no clear standards (rather, recommendations) and if we try to reduce all the main form factors of computer cases to one table, then we won’t succeed. First of all, because different information sources for the same product segment indicate slightly different values, and the case manufacturer can generally go beyond all tolerances, realizing another usability tenet 🙂

But, for reference, we still give two tables (one taken from Wikipedia, the other also from an authoritative source) that will help us determine the main form factors of the buildings. We look at the tables below:

And here is another one (from another source).

What sizes of cases are What sizes of cases are


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