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With regards to PC Gaming users, has to be the PhysX and Killer NIC. Neither are needed as the first doesn’t have any games, and a dual core or Quad core CPU would be plenty of grunt to do physics and fancy ball and tree movement. The Killer NIC won’t give you more FPS or better ping, as the FPS is done by your graphics card and the lag is mostly about your ISP. If we had to chose one, it would probably be the Killer NIC, based on the fact it is a decent network card.