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I would say that if you are at 465FSB and stable, then you *might* be able to squeeze out a little bit more, but I really do mean a little bit.
As to wether it is worth it or not, that depends on wether you are solely looking for benchmark results, or if you want 24/7 stability.
I'm not familiar with your motherboard, or how well it clocks in relation to others, but I would say that the chances are that your CPU is the limiting factor.
If it's just some big overclocks you are after, then you could try adding some extra
PLL voltage if you motherboard allows it, sometimes this is lumped together with the
SB voltage, or might even be called CPU
PLL or similar. Be aware though that while this will help your
FSB clocks, it will likely degrade your CPU quite quickly, and you may find that you end up with a CPU that won't clock very high.