I used to build desktops in the 1990's. For a while you could upgrade them cheaper than by buying a new one. After a while almost every upgrade required all parts to be replaced. The new motherboards had different form factors and required new cases/power supply and usually a different type of ram. Only a few of the cheaper parts could be reused.
For a while it was fun to go to computer shows and read Computer Shopper Magazine to source parts.
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