GTX 560 vs. Intel i5 2300 GTX is only 5.7 times faster than i5 with double floats in WebCL

Accelerated Computing CUDA CUDA Programming and Performance
1

GTX 560 is only 5.7 times faster than Intel i5 2300 in the Mandelbrot set test with double floats
http://www.ibiblio.org/e-notes/webcl/webcl.htm
As I think Tesla is 4 times faster more? :)

Evgeny