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Rendering utilizes the CPU and RAM. If the Project fits completely within memory, processing power is the only hardware factor in rendering. If the Project doesn't fit into memory, hard drive speed has some effect due to virtual memory swapping.
Graphics cards won't affect rendering speed, but will speed up the redraw in the Viewport, enabling you to work more interactively with complex Projects.

Does CINEMA 4D support my graphics card?

Unfortunately we can't provide specific compatibility information regarding 3D graphics cards due to the rapidly changing nature of the graphics card industry.

A list of graphics cards and drivers that are known to be compatible is linked from the main MAXON support page.

You can download our demo to test the graphics card yourself. If the card works well with the demo it will work well with the actual program.
You can also download our CINEBENCH application from our website here - www.maxon.net/downloads/cinebench/cineb...
This will test the performance of your graphics card and will give it a score. The higher the score, the better the performance.