It's 1.25Ghz. Unless people design their game to run on multi-CPU systems (which most people won't), you will be limited by the speed of one processor.
you will be limited by the speed of one processor.
That's what I figured, so I checked "Slow CPU". Although to someone whose first CPU ran at no more than about 1MHz, describing 1.25GHz as "slow" feels a bit odd. :-)