matlab2008a CUDA and ATI? can ATI accerlerating the progranmme in matlab2008?

my notebook is IBM T41P with a gpu 128MB ATI FireGL T2
today i do the example in matlab2008a from http://developer.nvidia.com/object/matlab_cuda.html
and the resualt

mex fft2_cuda.c -IC:\CUDA\include -LC:\CUDA\lib -lcudart -lcufft
mex fft2_cuda_sp_dp.c -IC:\CUDA\include -LC:\CUDA\lib -lcudart -lcufft
mex ifft2_cuda.c -IC:\CUDA\include -LC:\CUDA\lib -lcudart -lcufft
tic; FS_2Dturb(128,1,1,1); toc;
CFL =
0.1017
Gsqav =
1.1995
Elapsed time is 12.532435 seconds.

tic; FS_vortex; toc;
ans =
512
Elapsed time is 276.111860 seconds.

nvmex -f nvmexopts.bat Szeta.cu -IC:\cuda\include -LC:\cuda\lib -lcufft -lcudart
Szeta.cu
tmpxft_00000330_00000000-3_Szeta.cudafe1.gpu
tmpxft_00000330_00000000-8_Szeta.cudafe2.gpu
tmpxft_00000330_00000000-3_Szeta.cudafe1.cpp

tic; FS_2Dturb(128,1,1,1); toc;
CFL =
NaN
Gsqav =
1.1995
Elapsed time is 3.066627 seconds.

tic; FS_vortex; toc;
ans =
512
Elapsed time is 15.237857 seconds.

who can tell me what’s happening
why ATI GPU accelerating the CUDA programme?