Oeps, sorry, was a few days offline,
processor: AMD Athalon X4 645
psu: Corsair 450 which I will upgrade to 650W
It looks like HD6850 is the one to go for unless somebody would now state that my cpu/psu is not ok for that.
Thank you all so much for your time! I was into assembly more than 20 years ago, times where absolutely not all graphics cards would behave properly into a specific motherboard. These times seem to be over now and that's why I didn't get the required google results I suppose.
Thanks again and love to you all
bub