No, it will make 0 difference at stock. Stock = half the FSB of the CPU. i.e. Q6600 is 1066mhz FSB / 2 = 533mhz, & it will run ram at 533mhz at stock. Unless you make change to bios: unlink cpu & ram, & set ram to specs.
You need to know your upgrade goal or you're asking such question over & over. You want to improve overall speed of gaming, desktop apps, databases, etc.?