just had my friend coming and asking me to help him building new computer, while doing the installation I replaced my Duron 800 with his brand new AthlonXP 1700+ in my K7S5A mobo, Voila !!!!!... it works without any error, the BIOS automatically detected the CPU with setting 133/133. Gotta reduce my beer and cigarette consumption to buy this Athlon XP for me...😛.