You are not the only one, I was rather surprised too.
I was running OBSD amd64 on a board that I got as a present for my birthday in July of that year. Quite a leap from the 800MHz PIII I used before. Three months later Henning tells me amd64 possibly could be not the ultimate version.
But if you just imagine linked lists with 64 bit pointers in an amd64 version, you can imagine that traversing such a list takes more time then the same machine using 32 bit pointers for a similar linked list structure in i386 mode.
Henning mentioned something like this in another thread, but I haven't found it yet.
BTW In the same thread somebody points out the role of the gcc compiler. IIRC the quality of the 64 bits generated code hasn't caught up with the i386 in all cases.
Well at least we know for a database server, amd64 and a lots of RAM is the recommended platform.
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