What is a really good over clocking software for nvidia geforce 8400?

Q:

A: There isn't any for that card.. it's just a very weak model. For entry-level gaming performance in the Geforce line, you need x600 cards (6600,7600,8600 etc) and mid-level performance comes with x800 cards. Cards x400 and below are not intended for gaming, they are just inexpensive cards for general use, included with systems instead of integrated video.

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