"A non-reknowned overclocker going by the name of kris has submitted a validated CPU-Z result of an Athlon 64 X2 5000+ overclocked monstrously to 4851 MHz, which is nothing short of incredible from one of these chips given their tendancy to play up with cold bug issues and the like under extreme cooling."
tom's seems lucky to get that chip to 3.4 GHz in their review which same as you.
i'm only running x2 5000 at 3.1 GHz at stock voltage.
can't get a reliable prime95 in 3.2 GHz even with increased voltages.
that thing was a pain to overclock with my old mobo. but now since i upgraded to the MSI k9a2 platinum mobo, i was able to increase the voltages and stuff. i couldnt increase the FSB though. it became instantly unstable. my old mobo only allowed the highest voltage setting of 1.37V woohoo (sarcasm).
sadly, my memory isnt running at its full potental though... the multiplier overclocking reduced my DDR2 800 to DDR2 735.