Well, I have recently acquired an old AMD Athlon 64 4000+ gaming machine from 2005. I was tired of using Winblows XP and decided to install Debian. So far I am very happy with that OS and it fulfills my purposes (and then some). I have a lot of packages already installed (Xchat, banshee, Filezilla, Chromium, deluge, Claws-mail, etc) and it is epic. I also got a few custom themes for MATE, one was a Mac OSX-looking theme and a black and dark blue "delorean dark" theme. So I'm really happy about Debian and Linux in general and I hope to use it for many years.
Main: AMD FX 6300 six core 3.5ghz (OC 4ghz)
16gb DDR3, Nvidia Geforce GT740 4gb Gfx card, running Win7 Ultimate x64
Linux: AMD Athlon 64 4000+, 1.5GB DDR, Nvidia Quadro FX1700 running Debian Jessie 8.4.0