Unlock multiplier with bios moding for old amd sempron 2800+

[memet-sorin]

Hello, i have a motherboard with ami bios, my question is if i can unlock multiplier for AMD sempron 2800+ and if i can overclock the multiplier to get alt least 2000mhz whidout up'ing the FSB.
I hope you understant what i wrote, if you wont, i can write this in romanian, but google translate is going to f*k your brain even more.

I have two motherboards:
Asus k8v-x-se:http://www.asus.com/Motherboards/AMD_Socket_754/K8VX_SE/#download
Asrock k8nf3-vsta:http://www.asrock.com/mb/download.asp?Model=K8NF3-VSTA&o=BIOS

Beer's and thank's if someone can help me.

P.S. My interest is to get asus mb bios moding work.....asrock is still in waranty period.bye