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what i heard of is that if you order the AMD 64bit , you get the beta service pack2 from winxp with it.
on tom's hardware

but my system can handle all th enecesery programs without a problem. and i can take halflife2 on, soo
it will take some time before i upgrade my computer again.


No, you can get the Beta for SP2 for free from Microsoft.

What that article means is, that the Athlon 64 supports the NX-Flag (NX = No Execute), wich is used by SP 2 to protect your System, cause it can avoid buffer overflows. The program will just crash with an exception instead of executing malicios code. You don't need an 64 bit operating system, this works on 32 Bit Windows as well, but not on Pentium 4 processors.