I'd like to know the compatibility myself since the system requirements I've seen for Sim City 2013 are suitable for the original Sim City for decent graphics. The recommended requirements only mentioned dual core CPUs so the implementation of threading may not be extensive. If so, a 2.4 GHz processor may be fairly minimal.
The alert doesn't make much sense since your system information or Direct X adapter RAM should show something near 2GB. The game 3D implementation may not be extensive but the CPU demand should be greater than in the original game. Disabling some of the new features would make the game less appealing for some and curved roads is a definite requirement in my mind. I encountered the following general topic.