Wonderboy Anand deed onderzoek naar de overklokbaarheid van de 500 en 550MHz FC-PGA PIII's. Beide processors bleken met een maximale kloksnelheid van respectievelijk 750 en 825MHz bijzonder welwillend te zijn:
At the default core voltage of 1.60v, all of the 500E and 550E CPUs we tried worked perfectly at 750MHz and 825MHz respectively. And since these tests were run on a platform with official support for the 133MHz FSB, the ½ AGP clock divider allowed the 150MHz FSB to be used without any noticeable sacrifice of stability. At 825MHz, the 550E instantly becomes the fastest performer from Intel since the Slot-1 Pentium III line currently “only” goes up to 800MHz.
Even if you’re set on the i820 platform you can expect a similar overclocking potential out of the 500E/550E CPUs. And if you happen to get a poor yield and it won’t work at 750/825MHz, then the 140MHz and 133MHz FSB settings are always there, and once again, courtesy of the ½ AGP divider, they’ll both be stable regardless of what applications/games you’re running.