So you are asking is memory at a 5/6 (333) divider on a 266 clock is better than stock. Well 5/6 of 266 is 221.6 mhz or ddr443 effective, so yes the memory bandwith is better. Besides the increase in CPU speed is what you are primarily looking for even if you have to give up a little memory bandwith. You have managed to pick up CPU speed and bandwith, which is win/win compared to stock.