how many levels are you talking about?<p>I agree the worse floating point precision of GPUs puts them at a disadvantage but they still do better for massively parallel problems like fractal renders. (<a href="http:&#x2F;&#x2F;www.bealto.com&#x2F;mp-mandelbrot_benchmarks.html" rel="nofollow">http:&#x2F;&#x2F;www.bealto.com&#x2F;mp-mandelbrot_benchmarks.html</a>)