the ram and timing affect little on overall performance, while the PL have higher affect.. to get lower PL at higher fsb, u need to choose the right divider, usually 4:5 or 3:4 or 5:6 can achieve lower PL, so even at looser timing, it still perform better..

nb voltage and vdimm can help achieve lower PL stability after u get a right ratio. usually for 400 fsb, pl5 or pl6 is achievable..
this is the sample, it was a quadcore @400fsb PL6, dualcore is easier to do it.




Attached thumbnail(s)

i dont have lga775 system anymore so cant try more
btw, i found that DFI board will give better PL when same setting applied to it