Dave65, the first thing you need to do is sent that crap back where you got it and buy some Kingmax 5ns PC2700. Then you will be able to achieve much higher speeds. I'm and ex-OCZ owner. I had the PC3000 version though, and it wouldn't do over 145 with half decent timings. Trust me, do yourself a favor and get rid of the OCZ and get some real RAM. You'd be much happier even with the much cheaper Crucial PC2100, but I'd recommend the Kingmax 5ns PC2700 because it has true 5ns chips, not overclocked 7.5ns chips like the OCZ has.
Also, unlocking your chip will get you much higher FSB's as well because you will be able to lower your multiplier.