Upgrading computer from i586 to x86_64

Here my story, I am not expecting support, but point few issue, and giving 
experience. Of course what I did is clearly _unsupported_ :)

First explanations, my computer was a MSI kt7 turbo + Duron + 768 MB of RAM, 
this afternoon I buy MSI K8N Neo2 + Athlon 64 3000 + 1GB DDR.
The chalenge was to change only those components without reinstallaing my i586 
computer, and so upgrading i586 rpm to x86_64. Funny not ?

First step: replacing hardware, lot of screw loosed, one or 2 hours to place 
all connector... but you know this:

- booting, the system lock just after showing "remounting / rw", everything 
was fine when I boot with init=/bin/bash and mount all mountpoint manually. 
This issue still appear with kernel 2.6.11 x86_64, noapic solve the issue but 
I don't understand why.

- Installing a x86_64 kernel, rpm don't let me install it saying it is intend 
for x86_64, I had to use --ignorearch. This problem surrely come because CPU 
detecting routines are not present in 32 bits rpm code.

After rebooting, snd-emu10k1 module segfault causing kernel oops, I don't know 
it this issue is x8-_64 specific only, notice there is an integrated nvidia 
sound card on the motherboard, so I reinstall my creative one only for fun.

Currently, I have a 86_64 kernel on a full 32 bits system. And everything is 
working fine with workaround I explained.

Now I have to upgrade my rpms :)

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