333 will not work unless the board supports it. You can attempt to overclock it, but there are no guarantees. I suggest that you do a forum search, there are more than enough threads that talk about it.
why not run your memory at 266mhz? sure, you don't support 333, but no reason to run it at 200mhz. and since the memory's going to be underclocked, you can lower the timings on it.
and it's amazing that you have a p4 board with 6-phase power and you don't know anything about overclocking. increasing the frontside bus (fsb) will directly increase your cpu and memroy speed. you won't damage anything unless you're stupid about it and dial in large jumps instead of gradually going up and finding your limit. increasing your fsb by 25% should be easy to achieve and would cause your memory to run at 333. do it slowly, though. increase your fsb by 10mhz and use it for a while or run some benchmarks to make sure it's stable... then go up again. once it halts or doesn't boot, back it down a bit.
Its important to know how to get out of a jam in this situation On my board as I crawl up the fsb and push it I know that if I cant get a boot I need to hold the ( insert ) key as I boot to default all settings to the norm.. I would get the .pdf manual for that board and give it a good read so you will be able to feel safe knowing how to get out of a jam , there is also on the board a jumper you move over to reset the cmos ... and I would think as a last resort popping off the battery would also do that and give you a clean starting point .... better to know how to than not to be able to
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS