I'm a newbie, and I have an old Sony Vaio PCG-FX210 that had an AMD Duron 800 mhz. I installed a Duron 1600 mhz in it recently, and it registers as 1200 mhz. Does anyone know if there's a way to get the other 400 mhz out of it, or is it just stuck that way because of the old system board?