I'm upgrading, i have an athlon xp1800 cpu, ecs k7s5a board & 256mb pc2100 266mh memory. when it boots the first screen indicates a speed of only1150. cmos has the cup clock spees at 100 and if i change it to 133 i need to clear the cmos and start over to get anything but a black screen. things just don't seem right. any thoughts?