Which model? You may be able to pad mod the CPU to a 1066MHz or 1333MHz FSB. You might also have to pad mod the VID signals to raise the voltage.
A pad mod works by shorting contacts on the package with some conductive fluid, like a windshield defogger repair kit or PCB trace repair fluid, to make the CPU behave like a faster speed model by changing the detected FSB speed.
There is a slight chance that you could have a compatible clock generator on the motherboard that allows you to use a Windows-based overclocking utility. But don't hold your breath on that.