Scott Evans has a Athlon 1900 with 1.5 GB of RAM installed and has SIMCity 4. He says: "I have no problems at all until my cities got up around 5,000-plus people. However, from 5,000 and up it's laggy, even right after I load it."
The minimum requirements listed on the game are for a 900mhz processor with only 512MB RAM installed. This is leading many industry experts to say that it is misleading for companies like Electronics Arts to list unrealistic requirements.
One Game Mag editor counters: "Given the infinite combination of PC hardware and software components available and the unfeasibility of testing for every theoretical configuration, printed system requirements can't and shouldn't be taken as gospel." http://www.wired.com/news/games/0,2101,57464,00.html