a better idea than just raising the mulitplier would be to probably lower the mulitplier some and then raise the fsb, u get more performance that way, having more fsb is better than having a higher multiplier, the system bus is the speed at which u communicate with other devices, and if u have a higher sytem bus, the overall performance would improve, good luck on ocing
ps, always try to keep ur ram and pci freqs in spec, dont go above the pci freqs, u can corrupt ur os files that way, and raising the memory freq too high would just make ur system unstable, or it just wont POST. another thing, raise ur fsb as high as possible, then raise ur multi, that would tiled the best results, and if u wanna know more about OCing, u can just check out the stickies around