Intel CPU's do not really need extremely fast RAM since outside of benchmarking, there is really very little performance impact. However, if every 0.1FPS increase (to a maximum of 0.5FPS) is important, then go for it.
The reason why it is no longer important is because Intel does not use FSB anymore; Front Side Bus. FSB is linked to the RAM speed and that in turn is linked to the CPU's frequency. So increasing the FSB also increases the CPU's frequency.
Not anymore. Intel has switched to BCLK (Base Clock) and it basically is set to 100MHz and it uses the CPU's multiplier to determine the frequency. Unlike FSB which basically linked just the RAM and CPU, BCLK links to everything on the motherboard. That means PCI slots, PCI-e slot, USB ports, FireWire Ports, etc. Therefore, if you want to overclock an Intel CPU just by using the frequency, then you need to increase the BCLK above 100MHz.
But there is a catch... The PCI, PCI-e, USB and most likely FireWire ports are sensitive to the BLCK. Setting the BLCK "too high" (like 105MHz) can cause instability, non-functionality, or worse... permanent damage.