Tech question. [Graphics Cards]

There is a lot of people with SM3 GPU. What parts of interface are missing in SR2? I have a SM3 GPU that isn't installed in my PC because my PC has only AGP, while GPU has PCI-E. That is a some 1-2gb Radeon.
P.S. On SM2 GPUs in SP you cannot see the terrain near with you. But you can see Sky Park City and airports. All parts are visible, except some which came from mods (GPWS for example).