I’m running it on a p3 600 mhz with a geforce 4 and that could be considered the lower limit if you want the backward compatibility with uae. Aros itself run excellent on the 600. I think a machine that’s around 1,5 - 1,7 ghz is the absolute optimal buy on the cheap vs. power ratio scale. It is cheap and aros will outrun vista with ease. Uae will behave great. I think that here also goes the limit on the use of vesa, meaning that graphic card is not necessary, it will perform well on vesa that allows up to 1200*1024. So if you are in luck the cheap 1.5ghz machine have a graphic card that works out of the box. If not you have the pleasure of having a well working machine with vesa on the motherboards buildt-in, but the ebay hunt continues, and that is also one of the fun parts.