I tried a set of ocz before i found them very slow
Seeing as they have to meet an electronic technical specification I don't understand how you could have found them 'slow'?
Well i changed them to kingston hyperx computer ran much better straight away.
Perhaps you had bought RAM with the wrong specifications (i.e. slower than it should have been for the CPU), so the motherboard was throttling back the CPU speed? The small timing differences you see really don't make any difference to usability...
Otherwise it was psychological surely?