I'm not a gamer but I thought I'd check out the Steam engine on F20.
This is on the RPMfusion nonfree repo and installed with no problems.
However when running it I get a popup error saying:

OpenGL GLX context is not using direct rendering, which may cause performance problems.

For more information visit https://support.steampowered.com/kb_article.php?ref=9938-EYZB-7457.

A glance at the above URL reveals that the problem is probably due to
Steam being a 32-bit binary and I only have 64-bit libraries. I'm using
a GT630 video card with the NVidia proprietary driver (also from
RPMfusion).

Is this solvable without jumping through many hoops?