Bus speed no longer exists in Intel CPUs.
Core i3/i5/i7 now has BCLK (base clock). It is the single frequency for everything; CPU, PCI-e port, USB port, etc... and it is 100MHz. Overclocking above 100MHz is possible, but not recommended since the PCI-e port can become erratic when the BCLK is out of specs. The same goes for USB ports which may stop functioning above a certain BCLK frequency, or worse become permanently damaged.