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At 32x32 you can run any game at ultra settings.

Nope. Chances are that if you have only 2gb of ram, you might have an integrated card as well. Nope. I've tried. Unless you want really small window and no grass, you might be able to run at lowest settings at 15fps for a few minutes before your computer gets hot.

Rust is an indie game I believe, so it shouldn't be expected to have the best optimization. The graphics of rust looks like it should be able to run on integrated graphics, but it just isn't up to par with Source Engine.

i ran infestation saying 4GB i had only 2..

http://www.systemrequirementslab.com is generally quite acurate. It says you need 4gb.

Yes. I have only 2gb and I run it just fine.

The real issue is your dedicated video ram. check it at can you run it

Never trust system requirements.