I have a Compaq Presario 2195us- 512ram, 1.8ghz Athlon 2500+, and Radeon igp 320M.
Pretty crappy so far. I ran the two 'solutions' for graphics problems (deleting the cache and extracting the art file from assets). It was slow with black terrain, bread only, and eyes-and-chompers leaderheads. Last night went into the world editor to give myself satallites to reveal all the terrain. this worked, although everything seemed kind of murky (didn't mess around with options though to see about brightening). Still had the bread only problem. Game was pretty slow, and crashed before I had my second city built. Not sure what caused it- if I remember I was just mousing over terrain, but screen went black, speakers started clicking, and had to shut off my machine (couldn't even force-quit).
I'm going to return it or trade it to someone and wait for the mac version.