Quality matters more then sheer wattage. A very high quality well made 230W PSU can be better then a cheaply made 300W PSU.
Also, what matters the most is the combined wattage on the +3.3V and +5V leads... if the 230W PSU was relatively well of there and the 300W unit was weak in those areas it's again quite possible the 230W unit would do better.
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