Well, you can "easily" and "safely" get probably 25% more out of it. 50% is doable but not as easily or safely. Here's how...
25%
-Set HT multiplier to 4X. Your HT will be overclocked to 1000MHz but that should be fine, otherwise lower it to 3X and your HT will be underclocked by 50MHz, running at 750MHz but you'd never tell the difference. Now, socket 754 supposed to run at 800MHz on a 4X multiplier, but some motherboards have a 5X option still, which is why I mention this.
-Set RAM to 166MHz (some BIOS reports it as 333MHz). This will overclock your RAM to something like 416MHz from the default 400MHz of PC3200. Your RAM may or may not be able to do this, but most should with perhaps a small boost in voltage (set to 2.7v or 2.8v if you get RAM errors in Memtest). You may also have to manually set your CAS latency to what your RAM is supposed to be at 400MHz because some boards will "think" RAM is really running at 333MHz so will use the SPD settings to lower CAS to that level, resulting in problems because RAM is really running at 416MHz and not 333MHz.
-Set system bus speed to 250MHz
Enjoy. Your Sempron which defaulted to 1.6GHz should now be running at 2GHz, or roughly the equivalent of a Sempron 3300+.
50%
-Set HT multiplier to 3X. Your HT will be overclocked to 900MHz but that should be fine
-Set RAM to 133MHz (some BIOS reports it as 266MHz). Because of the overclock your RAM should now be running at the full 400MHz of PC3200. You may also have to manually set your CAS latency to what your RAM is supposed to be at 400MHz because some boards will "think" RAM is really running at 266MHz so will use the SPD settings to lower CAS to that level, resulting in problems because RAM is really running at 416MHz and not 266MHz.
-Set system bus speed to 300MHz
Enjoy. Your Sempron which defaulted to 1.6GHz should now be running at 2.4GHz. It is likely that the CPU can do that and some of the better overclocking boards can do that as well. As the system bus gets higher though... the overclock becomes less "guaranteed."
YMMV, meaning there are no guarantees in overclocking or sportsbetting. Research can increase your odds but it ultimately comes down to how good the parts/teams are and your luck.
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