What Computer is better and by how much ( a little, alot)?

This is my old computer http://www.cnet.com/products/dell-optiplex-gx280/specs/

This is the computer im getting
http://ironsidecomputers.com/index.php?main_page=product_info&cPath=28223_28241&products_id=344

How much better is the ironside. And dont tell me they both suck bc i know. My old computer broke, and the new one is easily upgradable. Can the new one run cs-go or gmod at high settings? And can it run rust on low?

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