Capacity would be the Fastest CPU that BIOS and Motherboard was designed to support when it was manufactured..
Although past experience has repeatedly taught me that by the time the CPU's hit that speed, the manufacturer went and changed the clock frequency or CPU voltage requirements for their CPU's so they won't work in my Motherboard anyway.. **sigh**
product: Pentium III (Coppermine)
vendor: Intel Corp.
physical id: 400
bus info: cpu@0
width: 32 bits
So yes my example system here has a PIII 933 in it.. theoretically I can install a 1.6 Ghz CPU in it provided the clock and voltage requirements still match.. also not that Pricewatch doesn't even list a PIII faster than 1.4 Ghz..