You'r enot out of luck - 1.25GHz is 1250 MHz - faster than the 867 required. What you need to look at though is how much RAM do you have - you need at least 512 - if you are lower than that you need to upgrade. Fortunatly installing RAM in an eMac is very easy - one screw on the bottom and the RAM cover comes off. At that point you are looking at the two RAM slots.