After much problems with my Duron 650Mhz that not wanted higher than 900Mhz.

I decided to swap to a 600Mhz and after that it was no problems

to reach over 1000Mhz.

And

 here comes some results from my new Duron 600Mhz

that reached 1104 Mhz with a ABIT KT7 Motherboard

both now running with 512Mb Memory Cas 2-2-2