My E4300 did not benefit at all from the 200-266 mod being done.
It worked......and the CPU would boot up at 266x9 2400 default.
But it didnt seem to change anything else as far as overclocks.
370fsb was and is about it. Modded or not makes no difference.
I didnt try the 333 mod since I know I cant boot 3GHz at default volts.