I have an AMD Athlon XP 1800, with a 1.53 GHZ processor speed. When I turn on my computer, it shows 1050 MHZ for my processor speed. Why does it shows 1050 MHZ rather than 1.53 GHZ it's supposed to an how can I make the change on my computer (BIOS) to recogzine the true output of the AMD Athlon XP 1800?