I have a Dell Inspiron 2500 with a Celeron 800 and 128 pc100. I have heard from some sources that I can upgrade to 1ghz with 512 and from other sources that I can only upgrade to 800mhz and 512. Which is it? I have seen 2500 series dells with 1ghz processors on ebay but I am unsure if the mobo's are the same. Unfortunately I got this laptop used and dont have the manuals. I also called tech support but they werent very helpful. Any help would be appreciated. Thanks!