As i'm planning to buy new System, i want to extract last bit of performance from my old one..

i remember one article in some digit issue but couldn't find it....so guys any help is appreciated....
thanks...
my config:-
AMD Athlon XP 2000+
ASUS A7N266-VM se
512 MB DDR RAM
(350 watt power supply(??))
i'm already thro' some the articles but didn't find anything useful...is there any AMD overclocking guide???