Tha 650 could probably do 1080p with all settings on 'Low'.
Emphasis on 'probably'.
Yuh go geh 60 fps in Plants vs Zombies easy.
Seriously... I would actually recommend a GTX 760 as an acceptable minimum for smooth gameplay at 1080p. (with 'Medium' to 'High' settings)
However, I do realize that not everyone's budget will enable that purchase.
You might be able to get away with them settings on a 750 in an older game-engine, like Unreal 3, or Source.
Fling Metro, Crysis or Battlefield at it, and some heavy compromises might be in order.
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