Building a desktop in 2020 vs 2000
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Even more stuff has gotten integrated into the motherboard
In 2000, you would have a video card(HDMI, DVI, VGA, S-component), sound card(3.5 mm), ethernet card(RJ 45), modem card(RJ 11) etc that would plug into PCIE lanes. Today other than the GPU everything else is integrated into the motherboard. If you are using a CPU with integrated GPU, then all your PCIE lanes will essentially be empty. Most noticeable change is the integration of SSDs into the motherboard with the M.2 slot. SSDs plug into motherboard slots just like RAM.
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Target audience: Gaming
In 2000, the desktop computer was aimed at Nerds and Geeks. Today the entire Desktop computer market seems aimed at gamers. You can see this in the branding everywhere. Motherboards have game related styling etc. A side effect of this is that commodity components(Amazon best sellers) for desktops tend to be costlier higher end ones. For eg: the best selling CPU on Amazon is a 12 core Ryzen 5. In 2000, the best selling components were the cheaper entry level ones. You also find RGB lighting and other styling options for GPUs, cases, motherboards. Even RAMs come with options for color lighting. In 2000, everything was a biege box and internal components had no styling options because they were hidden away.
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GPU size/price
GPUs used to be called video cards and were just one of many other cards that plug into the motherboard. Today they have grown both in size and price. Gamers today pay for the GPU almost as much as the rest of the computer combined. And the GPU has become large enough to be the largest visible component inside the Desktop. https://photos.app.goo.gl/zE6sQYFTPgaykvfr5. It consumes a disproportionate percentage of wattage supplied by PSU as well.
Overall I was pleasantly surprised by how many things have remained same over the years. Compared to many other things, building a desktop in 2020 is remarkably similar to building one in 2000.