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"Rising cost of memory," Microsoft explains why Windows 11 will use less RAM
(www.windowslatest.com)
This is a most excellent place for technology news and articles.
My xp laptop came with 512MB of ram. I'm pretty sure 256MB was typical.
For real, OP must have been rich. I ran Windows 7 on 1 GB well enough. It got slow eventually but I used it until 2016.