Lower the HT multiplier when raising the clock does not reduce performance. It prevents the HT from clocking too high and causing instability. On AM2, the HT link is never anywhere near saturated so even going slightly lower than 1000 has no performance impact.
AMD AM2 overclockers always lower the HT multiplier from 5x to 4/3x when overclocking this is a common and essential practice (otherwise you won't get higher clocks no matter what voltages you try) I don't know where you pulled that performance loss theory.
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