What is ATX?
ATX is a form factor for desktop computer cases, motherboards, and power supplies. ATX cases come in differing sizes, but they all are large enough to have a motherboard, at least one video card, and other hardware installed inside. Most ATX cases are able to hold several hard drives, both 2.5 inch and 3.5 inch, as well as at least one 5.25 inch optical drive. Other common features are 3.5 external drive bays, usable for installing hotswappable 3.5inch or 2.5inch drive bays and floppy disk drives, as well as other peripherals.
What ATX case should I buy?
There are two major size types among ATX cases and they are mid-tower and full-tower cases. Mid-tower cases are able to used for building gamer systems and enthusiast systems, but full-tower cases are especially suited for these system as they are much larger and will often allow for larger motherboards such as XL-ATX amd E-ATX form factors. With full-tower cases, you'll easily be able to install multiple video cards, a liquid cooling system, storage drives and case fans, as well as other hardware you might want. Mid-tower cases are plenty customizable as well, and are well suited for small office / home office (SOHO) computer systems as well as Home Theater PCs (HTPC).
What is the best ATX case for me?
You want a case that will fit your budget and is compatible with the hardware you want to install, but you also a bit of style, a bit of flair. You'll be able to find that in here. With cases featuring toolless drive bays, liquid-cooling support, side windows, included LED fans, as well as your standard hardware such as ATX motherboards and PSUs, 5.25 inch, 3.5 inch, and 2.5 inch drive bays, USB 3.0 front I/O ports and more you get a great selection that can probably fill everything you're looking for a case.
What features are needed for a workstation PC?
Workstation PCs can vary about as much as any other type of system, as what really matters is how the system is going to be used. If it's for standard office use and database access, then there's little need for it to be cutting-edge in terms of processing and graphics hardware. As this applies to cases, you'll be looking for something like a windowless ATX case with 3.5 inch and 2.5 inch drive bays for HDDs or SSDs, and 2 to 3x 5.25 inch drive bays for an optical drive and possibly some other peripheral hardware such as a flash memory card reader or eSATA ports. A case that comes with a power supply and a couple of 120mm-140mm fans will help get you started even easier. However, if you're looking to build a system that is used for multi-media editing, especially 3D and video, we highly recommend purchasing a quality PSU along with your case, as well as extra fans and a CPU liquid-cooling system. This is your money-maker, so you'll want your hardware to stay cool and efficient. Easy to use cable management inside you case will help tremendously when you have any maintenance to perform. You'll definitely want to have plenty of clearance for at least one video card, likely more. Fortunately, most of these cases are capable of holding more than one discrete GPU.
What is a mid-tower case?
Mid-tower (or middle tower) cases are the most common cases in the desktop realm. These cases are most often rectangular and rise like a tower if you're looking at them head on (hence the word tower). These cases come in many designs, colors, and features - such as side windows, built-in fans, lighting, etc.
What is a full-tower case?
A full-tower or super tower case is much larger than standard mid-tower models. These cases are popular among server builds, gamers, and people who want more space for either installing additional hardware, getting better airflow, and/or just like the look of it. Sometimes you may be required to go full-tower because your motherboard or graphics card simply won't fit in a smaller form factor case (such as E-ATX, XL-ATX or HPTX motherboards).