First PC was an APPLE II in 1980.
Then a BBC B in 1981, a BBC Master 128k in 1983, an Acorn A3020 around 1987, An Acorn Risc PC600 in the early 1990's followed by a Risc PC700.
Then a Tiny Pentium 120 in the mid 1990's, a homebuilt Celeron 450MHz, which I then upgraded to 750MHz and then 1 GHz (and still have, running as a home router). I currently a P4 2.4GHz and a P4 2.8GHz.
(Prior to 1980 I used the CEGB mainframe)