I have AMD Athelon XP 2100 @ 266Mhz FSB on ASUS A7N8X Deluxe MoBo. But when I boot up and screen shows speed of 1500 not 2100!! What might be the problem? Jumper seems to be on the right place at 266Mhz FSB. Is there anything else I need to check to make sure the max speed can be performed with my system?