ATI HD 2400 is slower than NVIDIA 8400GS
 

It seems that in a head to head comparison, Nvidia might have a winner, since 8400GS running at 450/400 (GPU: RAM in DDR mode) will score around 1600 3DMarks 06, while HD 2400 Pro at 520 MHz for the GPU and 500 MHz for the memory will barely score 1250 3DMarks.

http://www.theinquirer.net/default.aspx?article=40225