Btw, I hate to break this to you, but l2 cache does not affect performance on the 64 as greatly as it does on the intels. Check the sempron 3100+ overclocking on xbit.
Also, currently, intel's dual cores are 64 bit enabled i think.
Finally, your 2nd statement almost makes no sense. Most people have used intel processors. There everywhere. Even AMD freaks have used it probably, unless they used the k-5s instead of the pentiums heh.