It's been a number of years and thought I'd try my 1 year old PC with a 2m SuperPi figure, compared to the my previous PC specs since 2005ish
Intel i5 3.4ghz 8GB RAM (desktop) = 23.011 sec
Core 2 Quad Q9300 2.5ghz, 4GB RAM (desktop) = 47sec
Core 2 Duo T8300 2.4ghz 2GB RAM (laptop) = 52sec
Pentium 4 3.0ghz HT 1GB RAM (desktop) = 1m 50sec
Intel Celeron D 1.6ghz 512MB RAM (desktop) = 2m 00sec
Intel Atom 1.6gh 1GB RAM (netbook) = 3m 30sec
Pentium 4 1.8ghz 256MB RAM (desktop) = 5m 16sec
Intel Celeron 2.0ghz 512MB (desktop) = 8m 50sec
EDIT : Oh I see single thread, so a little pointless :/