Most mainstream boards these days have four RAM slots, although compact Mini-ITX models often have just two, and high-end HEDT boards frequently offer eight. The amount of slots of course limits the amount of RAM you can install.
But for mainstream tasks and games, 16GB is sufficient and 32GB is ample. And even with just two slots, you can install up to 32GB of RAM. Note, though, that you may pay a slight premium for a 32GB kit that uses two 16GB sticks, rather than a 32GB kit that’s spread across four 8GB sticks. In some cases you can even install 64GB in just two slots.
What expansion slots do you need?
You’re most likely to come across just two types these days: the short PCIe x1 shot (often used for things like USB and SATA expansion), and the longer PCIe x16 slot (used for graphics cards, RAID cards, and extremely fast PCIe storage like Intel’s Optane 905 SSD). If you’re just planning on installing a single graphics card, a couple of SATA/M.2 drives, and perhaps a video capture or sound card, you should be fine with most ATX or Micro-ATX boards, which offer at least one x16 slot and one or two x1 slots.
However, figuring out how many drives and cards you can install is tricky, because no matter how many physical slots you have, there's a limited number of HSIO (high-speed input/output) lanes and PCIe lanes that all of your components must share. We could spend 3,000 words trying to explain how these lanes work, but the bottom line is that many mainstream motherboards compensate for bandwidth limitations by switching some connections off when you install hardware in specific slots.
For example, adding a PCIe M.2 drive may disable some SATA ports, or installing a card in a third PCIe slot may disable a second (or third) M.2 slot, etc. These issues vary greatly by motherboard model, so you’ll need to consult online manuals before buying--especially if you’re planning on loading up your board with lots of components.
That said, if you are planning on plugging lots of drives and cards into your PC, it’s worth considering one of the high-end HEDT platforms, as they have more PCIe lanes to work with. All of AMD’s Threadripper processors have 64 lanes (60 from the CPU, 4 from the chipset), while Intel’s competing Core X platform provides up to 44 lanes, depending on the CPU, and up to 24 more from the chipset. So if you’re planning on plugging, for instance, multiple graphics cards and a RAID array of PCIe/NVMe storage, or other bandwidth-hungry hardware into your system, these higher-end platforms are definitely the way to go.
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