With the particular ram that you have...in your case a higher multiplier would be better because right now you are running a 1:1 ratio with your CPU and RAM....both are communicating at 266FSB cause the ram is DDR (Double Data Rate) you look at your FSB currently 133 so 133x2 = 266 and PC2100 RAM = 266 I believe. Now...if you got PC3200 ram...then it'd be more beneficial to lower your multi and raise your FSB. From the temps you said, you could probably push it a LITTLE more....but I don't know the stability of that chip. So if you do push it dont blame me if it breaks =) I would say that the highest you'd probably be able to reach would be 133x13 for 1.729 buuut that could be pushin it as far as stability goes, but your temps certainly look like they can handle some more pushin.... You'd probably need to add a TAD bit more vcore though if you upped your multi again. I don't know how well putting the vcore on auto works...never tried it...also never tried FULLY overclocking cause I can't afford to mess up. Good luck