Which of these are better for gaming?

http://store.hp.com/us/en/mdp/desktops/envy-desktop#!&TabName=features

http://www.dell.com/us/p/xps-8700/pd?oc=ddcwgp103rs&model_id=xps-8700

For the HP, I am willing to pay the first or second configuration, just not the last. My budget is $750 - $800, nothing higher than $800. The type of games that my PC should be able to run are Minecraft and most Steam games. Thanks in advance.

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