diferent between sql 2005 x86 and x64 ?

I have AMD X2 64 bit processor, and try to install sql server 2005 developer edition. Which one should I choose x86 or x64 ?

Is there a problems if I migrating file database from x86 platform to x64 and from x64 to x86 ?

thanx

There is a great explanation for these architectures (processor types) on wikipedia:

X86:http://en.wikipedia.org/wiki/X86

X64:http://en.wikipedia.org/wiki/X64

Thanks

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I'm not asking about processor but about MSSQL 2005 x86 and MSSQL x64 is it different in database architecture or platform only ?

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Check if this helps:http://search.techrepublic.com.com/search/64-bit+and+Microsoft+SQL+Server+and+benefit.html

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