Well now i feel stupid.
I found out the GT610 is the last thing u want to have in your pc. I just installed the HD4800 from my old computer into my new computer. After a strange CPU cooler bios error, iam back on my desktop. The 610 is that bad even your onboard chip performs better.
And shadeC runs with 200 fps instead of 50. Wow.
Ill send my demoscene to a friend. Iam pretty sure he will have good framerate too, cause hes using a gaming pc (cause he is a gamer laugh )
530fps
and he said he didnt spend that much for the gpu(i correct myself, 500€ is not cheap, but theres open end).
All in all it seams like the stone old Radeon is still not that bad.
Thanks a lot for your help.